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  1. "Can we take the grackle successes and apply them to threatened species, see if it helps them survive in human-modified environments?"

    Cool writeup and video short on #TheGrackleProject and #ManyIndividuals

    bsky.app/profile/ucsantabarbar

  2. "Can we take the grackle successes and apply them to threatened species, see if it helps them survive in human-modified environments?"

    Cool writeup and video short on #TheGrackleProject and #ManyIndividuals

    bsky.app/profile/ucsantabarbar

  3. What can a bird that drinks tequila and eats chips and salsa teach us about conservation? #TheGrackleProject and #ManyIndividuals are featured in the press at UCSB!

    A huge thank you to Sonia Fernandez and Jessie Ward O'Sullivan for making this happen 🙏

    👉 Do you see grackles in your backyard in Santa Barbara, California? If so, please let me know! We are looking for more places to do this research

    🎤 Interview: news.ucsb.edu/2026/022535/grac
    🎥 Video: youtu.be/imZNHhjGOeY

  4. What can a bird that drinks tequila and eats chips and salsa teach us about conservation? #TheGrackleProject and #ManyIndividuals are featured in the press at UCSB!

    A huge thank you to Sonia Fernandez and Jessie Ward O'Sullivan for making this happen 🙏

    👉 Do you see grackles in your backyard in Santa Barbara, California? If so, please let me know! We are looking for more places to do this research

    🎤 Interview: news.ucsb.edu/2026/022535/grac
    🎥 Video: youtu.be/imZNHhjGOeY

  5. Grackles are amazing. This is aqua purple standing on top of a tower waiting for me to set up the test so he can do a bunch of trials in his reversal learning task

    I trained them to come to the towers and wait for me when they are ready to be tested. Sometimes it takes me 5 minutes to set up the test and they just stand there waiting

    What I love is that they tell me when they want to do tests and we both understand what the other wants. These are wild birds who willingly (and eagerly!) participate in behavioral choice tests, even when they get frustrated when the rules change (that is part of the test)

    #TheGrackleProject #ManyIndividuals

  6. Fieldwork simplifies bird identification: the bird on the left is "not a grackle", the bird in the middle is "not a grackle", as is the bird on the right #TheGrackleProject

    For actual ID's see alt text.

  7. Fieldwork simplifies bird identification: the bird on the left is "not a grackle", the bird in the middle is "not a grackle", as is the bird on the right #TheGrackleProject

    For actual ID's see alt text.

  8. I started Aqua Purple’s behavioral observations a few weeks ago and it has been difficult to follow him for long periods of time.

    Why? He is a magician! One second, I see him under a car in the parking lot. The next second, he has vanished 🪄 into thin air. I search 🔍 for several minutes, but usually can’t refind him. Where did he go? 👀

    When I am able to keep him in sight, he is quite the buffet bird - he goes back and forth through the parking lots finding food along the way.

    When he finds a piece of food, he likes to eat lots of it before moving on.

    And he is big on napping 💤 - loves his naps under cars 🚗 or in a palm 🌴
    #TheGrackleProject #ManyIndividuals

  9. Aqua Aqua also remembers the feeders we use for testing - I started habituating the new grackles to the test feeder this week and Aqua Aqua came running over to get some free food. He was a bit hesitant to take a piece of food from the feeder tray at first, but he warmed up quickly and kept coming back for more.

    It had been 10 months since he last saw one of these feeders!
    #TheGrackleProject #ManyIndividuals

  10. Further evidence in support of grackles remembering specific humans (or maybe the trap in this case), is Red who also hadn’t seen us for 9 months. Last week, he approached us where we were trapping. He stood on the picnic table next to us, 👀 staring at us and the trap, then flew off.

    This is not how a grackle who has never seen us before or grackle that is indifferent to us approaches us or the trap. This indicates that Red recognized us and/or the trap
    #TheGrackleProject #ManyIndividuals

  11. 9 months after I last saw him, great-tailed grackle, Aqua Aqua remembered me! When I returned a couple of weeks ago and he first saw me, he came close, stared at me, and was probably waiting for something interesting to happen (like a test or something).

    ❓ Grackle #memory is something we have wondered about on #TheGrackleProject. Do the individuals we work with remember us? If so, for how long?

    We know that grackles can recognize individual humans because when we used to do tests in aviaries with them, sometimes a grackle would only work with one of us (or sometimes only one gender, which can be tricky on a team with mostly women!).

    But after we released them to the wild, they didn’t treat us differently from other humans. It wasn’t clear whether they just didn’t care, or didn’t recognize us. I think Aqua Aqua has answered this question! ✅

    #ManyIndividuals

  12. 🙏 A huge thank to the many people involved in making this research happen! The acknowledgements sections of both articles are huge!

    ❤️ Of course, we couldn’t have done this without the amazing support from Richard McElreath and the Dept. of Human Behavior, Ecology and Culture at the Max Planck Institute for Evolutionary Anthropology

    💕 The University of California Santa Barbara has been the steady supporter over all of the years of #TheGrackleProject - providing a home and a place to base the (many!) permits out of, and support through cooperation agreements - thank you!

    📰 Press release: mpg.de/25179774/0811-evan-expl
    📎 Articles: doi.org/10.24072/pcjournal.593 and doi.org/10.24072/pcjournal.591

  13. Great-tailed grackles in a #population toward the northern edge of their #range (Sacramento/Woodland, California) were less #related to each other, which means that they #dispersed farther from where they hatched 🐣 than grackles in a population nearer the center of their range (Tempe, Arizona).

    In particular, females in Arizona stay closer to home 🏡 than males, while females in California disperse farther away from home ✈️ like the males do. To keep pushing the edge of the geographic range further, both males and females must be present so they can breed in the new areas.

    Now we know that there are 2 things that are different about the grackles on the edge: they are more #persistent and they disperse farther from where they hatched (especially the females)

    Thanks to @DieterLukas for leading this article on grackle genetics and dispersal! #TheGrackleProject

    📰 Press release: mpg.de/25179774/0811-evan-expl
    📎 Article: doi.org/10.24072/pcjournal.591

  14. #Vogelarten: Erkundungsfreude & geringere Sesshaftigkeit treiben schnelle Ausbreitung in neue Gebiete voran. 🐦‍⬛ Zwei neue Studien @peercomjournal.bsky.social von einem intl. Team um Corina Logan, @dieterlukas.fediscience.org.ap.brid.gy & Kelsey McCune. #TheGrackleProject www.mpg.de/25181118/081...

    Erkundung neuer Gebiete und ge...

  15. Even though we measured 4 behaviors: #exploration of new environments and novel objects, #boldness, persistence, and motor diversity, only 2 were consistent across individuals (exploration of a new environment 🔎 & persistence :loading: ). Consistency indicates it’s a stable trait that can be compared with other stable traits (like flexibility)

    After the reliability analyses, we then knew that we could conduct the analyses to see if exploration and persistence correlated with behavioral flexibility. We found that the flexibility-trained grackles were more exploratory, but there was not a strong relationship with persistence. Perhaps exploration helps them figure out what is functional/useful in their environment so they can use their flexibility to make good choices

    Thanks to Kelsey McCune for leading this article and rocking the individual differences angle! #TheGrackleProject

    📰 Press release mpg.de/25179774/0811-evan-expl
    📎 Article doi.org/10.24072/pcjournal.593

  16. 🪧 2 new articles from #TheGrackleProject!

    🔍 Grackles who were #trained to be more #flexible were more #exploratory after the training than untrained grackles. This indicates that the more an individual investigates a novel object, the more it can learn and adapt its #behavior accordingly

    ✈️ Grackles in an edge #population disperse farther than those in a more central population. This suggests that the rapid geographic range expansion of great-tailed grackles is associated with individuals differentially expressing #dispersal behaviors

    🗺️ These results suggest that flexibility, exploration, and dispersal are key traits involved in this species’ rapid expansion into new areas

    💪 They started as #RegisteredReports @ #PCIEcology @PeerCommunityIn years ago! After lots of hard work from many collaborators (including @DieterLukas) they are now at the #diamondOA @PeerCommunityJournal 🎉

    📰 Press release: mpg.de/25179774/0811-evan-expl
    📎 Articles: doi.org/10.24072/pcjournal.593 and doi.org/10.24072/pcjournal.591

  17. „behavioral flexibility, while helpful in allowing birds to adapt to new environments, is not the primary facilitator for range expansion“

    news.ucsb.edu/2025/021980/both

    #TheGrackleProject

  18. „behavioral flexibility, while helpful in allowing birds to adapt to new environments, is not the primary facilitator for range expansion“

    news.ucsb.edu/2025/021980/both

    #TheGrackleProject

  19. There are so many people to thank who were involved in making this research happen! The acknowledgements sections of both articles are massive - it took a village to do this research!

    None of it would have been possible without the immense amount of support from Richard McElreath and the Dept. of Human Behavior, Ecology and Culture at the Max Planck Institute for Evolutionary Anthropology 💕

    The University of California Santa Barbara has been the steady supporter over all of the years of #TheGrackleProject - providing a home base for the project, a place to base the (many!) permits out of, and support through cooperation agreements - thank you! 💓

  20. The growing body of research we have been conducting on #TheGrackleProject is showing that #behavioral #flexibility enables birds to #adapt to #human #modified #habitats 🌆 , but plays a smaller role in expanding into new #geographic areas 🗺️

    Moving to new towns likely involves more #persistence because we previously found that grackles on the edge of their range in northern California had similar levels of average flexibility (though higher variance), but were more persistent than grackles nearer the center of their range in Arizona peercommunityjournal.org/artic

    This is also supported by the fact that the preliminary data we were able to collect on persistence in boat-tailed grackles (who are not rapidly expanding their geographic range) showed that they are less persistent than great-tailed grackles, while having similar levels of flexibility
    Articles: doi.org/10.24072/pcjournal.573 and doi.org/10.24072/pcjournal.582
    Press release: mpg.de/25000634/0701-evan-when

  21. #Behavioral #flexibility is not the primary facilitator of a rapid #range expansion. Although we found high levels of flexibility in 2 successful urban bird species (great-tailed & boat-tailed grackles), only one (great) is rapidly expanding its range. This suggests flexibility alone doesn't drive rapid range expansions

    #TheGrackleProject went to Florida to study boat-tailed grackle flexibility and compare it with the great-tailed grackles. These species look and behave so similarly, if they were right next to each other, I couldn’t tell them apart (except greats have yellow irises and these boats had brown irises). They are parking lot birds through & through! 🅿️

    But in the aviaries, it becomes obvious really quickly that the great-tailed grackles are much more persistent - they will try and try to solve something, whereas a boat-tailed grackle often just sits on their perch 🐥, looks at the apparatus & decides not to even try

    doi.org/10.24072/pcjournal.582
    mpg.de/25000634/0701-evan-when

  22. #Behavioral #flexibility is not the primary facilitator of a rapid #range expansion. Although we found high levels of flexibility in 2 successful urban bird species (great-tailed & boat-tailed grackles), only one (great) is rapidly expanding its range. This suggests flexibility alone doesn't drive rapid range expansions

    #TheGrackleProject went to Florida to study boat-tailed grackle flexibility and compare it with the great-tailed grackles. These species look and behave so similarly, if they were right next to each other, I couldn’t tell them apart (except greats have yellow irises and these boats had brown irises). They are parking lot birds through & through! 🅿️

    But in the aviaries, it becomes obvious really quickly that the great-tailed grackles are much more persistent - they will try and try to solve something, whereas a boat-tailed grackle often just sits on their perch 🐥, looks at the apparatus & decides not to even try

    doi.org/10.24072/pcjournal.582
    mpg.de/25000634/0701-evan-when

  23. In the process of studying #behavioral #flexibility in great-tailed grackles on #TheGrackleProject, we discovered 🎉 a new measure of flexibility! The grackles that were more flexible in the reversal learning test also switched between eating different food types more often in the wild 🌮 🍿 🍪 🍒

    This is such an exciting discovery because it is really difficult to bring birds into aviaries to measure their flexibility. Now we have the ability to measure their flexibility just by watching them in the wild!

    This will make studying flexibility much more accessible to a wide range of researchers because, apart from needing to be able to tell the individuals apart, all that is needed is a pair of binoculars
    Article: doi.org/10.24072/pcjournal.573
    Press release: mpg.de/25000634/0701-evan-when

  24. In the process of studying #behavioral #flexibility in great-tailed grackles on #TheGrackleProject, we discovered 🎉 a new measure of flexibility! The grackles that were more flexible in the reversal learning test also switched between eating different food types more often in the wild 🌮 🍿 🍪 🍒

    This is such an exciting discovery because it is really difficult to bring birds into aviaries to measure their flexibility. Now we have the ability to measure their flexibility just by watching them in the wild!

    This will make studying flexibility much more accessible to a wide range of researchers because, apart from needing to be able to tell the individuals apart, all that is needed is a pair of binoculars
    Article: doi.org/10.24072/pcjournal.573
    Press release: mpg.de/25000634/0701-evan-when

  25. ⁉️ How do you train a grackle to be more flexible? Serial reversal learning! #TheGrackleProject has them form a color 🎨 preference, and then reverse the preference over and over again until they get fast at reversing (it only takes 6-8 reversals to get fast)
    nerdculture.de/@CorinaLogan/11
    doi.org/10.24072/pcjournal.284

    The wide ranging effects of the flexibility training led us to start the #ManyIndividuals project to see whether we can train threatened and endangered species to be more flexible, and if this helps them survive in human-modified environments (where the grackles shine)
    github.com/ManyIndividuals/Man

  26. ⁉️ How do you train a grackle to be more flexible? Serial reversal learning! #TheGrackleProject has them form a color 🎨 preference, and then reverse the preference over and over again until they get fast at reversing (it only takes 6-8 reversals to get fast)
    nerdculture.de/@CorinaLogan/11
    doi.org/10.24072/pcjournal.284

    The wide ranging effects of the flexibility training led us to start the #ManyIndividuals project to see whether we can train threatened and endangered species to be more flexible, and if this helps them survive in human-modified environments (where the grackles shine)
    github.com/ManyIndividuals/Man

  27. 🔥 Hot off the press from #TheGrackleProject!
    🌇 When the city comes to you, be #flexible
    When you go to the city, be #persistent

    Great-tailed grackles who were #trained to be more flexible used a wider variety of foods 🍿 and #foraging techniques, but had similar #habitat use patterns and #social behavior as non-trained grackles.

    Given that this species is rapidly expanding its geographic #range 🗺️ and shifting more toward #urban 🏙️ and #arid 🏜️ environments in recent years, our finding could suggest that foraging breadth (the number of different food types an individual eats) is a factor in #adapting to #Human-modifiedEnvironments

    Article: doi.org/10.24072/pcjournal.573
    Press release: mpg.de/25000634/0701-evan-when

  28. 🔥 Hot off the press from #TheGrackleProject!
    🌇 When the city comes to you, be #flexible
    When you go to the city, be #persistent

    Great-tailed grackles who were #trained to be more flexible used a wider variety of foods 🍿 and #foraging techniques, but had similar #habitat use patterns and #social behavior as non-trained grackles.

    Given that this species is rapidly expanding its geographic #range 🗺️ and shifting more toward #urban 🏙️ and #arid 🏜️ environments in recent years, our finding could suggest that foraging breadth (the number of different food types an individual eats) is a factor in #adapting to #Human-modifiedEnvironments

    Article: doi.org/10.24072/pcjournal.573
    Press release: mpg.de/25000634/0701-evan-when

  29. New from #TheGrackleProject: "using multiple different methods for measuring boldness and exploration...our findings improve our understanding of the traits that are linked with flexibility in a highly adaptable species"

    ecoevorxiv.org/repository/view

    Recommended at #PCI_Ecology by @jeremyvancleve
    ecology.peercommunityin.org/ar

  30. New from #TheGrackleProject: "using multiple different methods for measuring boldness and exploration...our findings improve our understanding of the traits that are linked with flexibility in a highly adaptable species"

    ecoevorxiv.org/repository/view

    Recommended at #PCI_Ecology by @jeremyvancleve
    ecology.peercommunityin.org/ar

  31. Catching up on #fieldwork #research with #TheGrackleProject: the great-tailed grackles in California often foraged in the shade, however limited the shade was.

    Not sure whether they don't want to stare into the sun, are better hidden from predators, prefer the lower temperature,...?

  32. Catching up on #fieldwork #research with #TheGrackleProject: this female great-tailed grackle in California wanted to make sure that we collect the correct data...

  33. Catching up on #fieldwork #research with #TheGrackleProject: grackles mostly ignore each other, but these two juvenile male boat-tailed grackles in Florida got into a disagreement....

  34. Catching up on #fieldwork #research with #TheGrackleProject: grackles mostly ignore each other, but these two juvenile male boat-tailed grackles in Florida got into a disagreement....

  35. #TheGrackleProject is winding down our 2024 #ManyIndividuals field season and wow has it been amazing! The grackles here eagerly participate in the research, which makes it really exciting.

    A huge thank you to our field site hosts!
    - The Santa Barbara Zoo sbzoo.org/

    - The City of Santa Barbara Parks and Recreation and Waterfront sbparksandrec.santabarbaraca.g

    - And I am in the process of making connections with the Chumash. The land on which I conduct this research is unceded Chumash land. I want to bring awareness to their efforts to reconnect with their land. I will mention a couple of efforts here, but I am still learning, so expect more on this front (including a Land Acknowledgement). Specifically...
    - The SPACE is an amazing organization that is bringing communities together sunan-the-space.org/
    - I attended a Decolonized Native Art show, which was gorgeous, powerful, and eye opening facebook.com/people/Decolonize

  36. After 9 years of studying them, these grackles continue to amaze me!

    This field season is the first where we implemented the comparative cognition experiments in the wild instead of in aviaries. I was worried that they wouldn't participate even when they were frustrated with the test (suddenly changing the food from the preferred color feeder to the other color feeder is an annoying thing to do to someone).

    Not only do they participate as much as, or more than, the grackles in the aviaries, they do all of this in the middle of public spaces where people/cars/dogs walk right by the feeders. WOW! I am so impressed by these birds! Thank you grackles for playing games with me!

    #TheGrackleProject #ManyIndividuals

    ALT: Orange made the correct choice (dark gray feeder), eats crackers from the tray, goes to the water cup between the feeders and drinks water. He chooses the dark gray feeder, I press the remote (“boing” sound), food comes out, I record his choice, and he eats from the tray

  37. What does a grackle eat for lunch?

    Aqua goes buffet style up and down the beach where he hits up the picnic area, the outdoor cafe, the seaweed on the beach, and the parking lots. Last week, he ate insects, worms, grass, mashed potatoes, a banana, a tortilla, and Mannerschnitten.

    Orange is a home body and sticks to his parking lot and cafe where he enjoys Splenda and clams.

    Silver is a people lover and hangs out ON people's picnic tables while they are eating (he snatched a big piece of lobster and lunch meat), as well as making the rounds to all of the people in the parking lot who throw food to the birds.

    #TheGrackleProject #ManyIndividuals

    ALT: I am voice recording Aqua's foraging behavior at the beach using binoculars until he lands near me

  38. EXTRA
    We found that grackles use self control using a go no-go test on a touchscreen computer. Yep, grackles can use computers! I don’t know of an experiment in corvids that is comparable to our self control experiment and I also don’t know of corvid tests that use computers

    Video youtu.be/TXFOYqZztf4?feature=s

    Grackle self control: doi.org/10.26451/abc.09.01.03.
    Grackle touchscreen training: doi.org/10.1371/journal.pone.0
    #TheGrackleProject

  39. #5 Grackle vs Corvid - Motor inhibition on the detour task
    Grackles make the correct choice & detour to the side of a transparent tube to get food in 70.6% of the time, Eurasian jays 58.3%, & Western scrub jays 76.7%
    Score 3:5 (tie bc grackles are at high end of corvid range)

    Video youtu.be/TXFOYqZztf4?feature=s

    Grackle: doi.org/10.26451/abc.09.01.03.
    Corvid: doi.org/10.1073/pnas.132353311 (NOTE: other researchers ran the research on the other species & I used their methods to test grackles)
    #TheGrackleProject

  40. #4 Grackle vs Corvid - Flexibility measured as reversal learning
    Reversal learning speeds (average # of trials):
    Great-tailed grackles = 74
    Pinyon jays = 155
    Clark’s nutcrackers = 143
    California scrub jays = 191
    Score 2:4

    Video youtu.be/bALXB2S4OpI

    I compared the grackle data with studies on other species who used similar methods and passing criteria. See 4th paragraph of the Discussion in this grackle article for all references: dx.doi.org/10.24072/pcjournal.
    #TheGrackleProject

  41. #3 Grackle vs Crow - String pulling
    Only 1 grackle spontaneously pulled a string, while many crows spontaneously pulled strings (though, at the individual level, crows did not attend to the functional differences among the strings).
    Score 1:4

    However, in a later experiment using a puzzlebox, most grackles pulled a string, which was one of four methods of accessing the food (doi.org/10.24072/pcjournal.284)

    Grackle: doi.org/10.1098/rsos.160247
    Crow: doi.org/10.1098/rspb.2012.1998
    #TheGrackleProject

  42. #2 Grackle vs Crow - Stick tool use
    Grackles didn't spontaneously use a stick to obtain food from a hole, while crows did.
    Score 1:3

    This isn't surprising bc New Caledonian crows make & use tools in the wild, while grackles do not. However, after this article came out, someone in Texas said they see grackles using sticks to pull dead bugs out from the base of the car’s windshield. Mb pop diffs in grackle tool use?

    Grackle doi.org/10.1098/rsos.160247
    Crow doi.org/10.1016/j.anbehav.2006
    #TheGrackleProject

  43. #1 Grackle vs Crow -Aesops Fable water tube tests
    - Heavy vs light: most grackles & all crows preferred to drop functional heavy objects. Score 1:1
    - Wide vs narrow: no grackles had a tube preference, while most crows preferred to drop objects into the functional wide tube. Score: 1:2

    Video youtube.com/watch?v=l5rHHb52vA. I ran these tests on great-tailed grackles & New Caledonian crows using similar methods & apparatuses. #TheGrackleProject

    GTGR: peerj.com/articles/1975
    Crow: dx.plos.org/10.1371/journal.po

  44. Hi @ct_bergstrom and @cobalt Thanks for inspiring a thread on grackle vs crow cognition! It turns out that the grackles are quite the contenders - sometimes their performance is the same as crows, sometimes worse, and sometimes better. Here are the details…
    #TheGrackleProject

  45. Are grackles on the edge more flexible? Edge grackles have higher variance in flexibility (but not higher avg) & are more persistent than non-edge grackles (no diff in exploration/innovativeness). Also, this species shifted toward living more in urban, arid environments. Articles were #PeerReviewed @PeerCommunityIn Ecology, published
    @PeerCommunityJournal #TheGrackleProject
    Press release mpg.de/20729532/0809-evan-a-bi
    Article (edge) doi.org/10.24072/pcjournal.320
    Article (habitat) dx.doi.org/10.24072/pcjournal.

  46. #introduction #introductions
    I investigate how behavioral flexibility relates to invasion success in grackles (#TheGrackleProject github.com/corinalogan/grackle)
    & whether training species to be more flexible increases their chances of success in human modified environments (#ManyIndividuals github.com/ManyIndividuals/Man)

    Cofounded #BulliedIntoBadScience (bulliedintobadscience.org) & Peer Community in Registered Reports (@pcirr rr.peercommunityin.org) to innovate publishing & make RRs accessible to all