Jeroen Zewald
@zewaldj.bsky.social
PhD studying playful Goffin's cockatoos 🦜
Reposted by Jeroen Zewald
Our new theoretical paper on combinatory tool use origins is out !
with @raccoonologist.bsky.social
onlinelibrary.wiley.com/doi/epdf/10....
with @raccoonologist.bsky.social
onlinelibrary.wiley.com/doi/epdf/10....
The flexible, the stereotyped and the in‐between: putting together the combinatory tool use origins hypothesis
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onlinelibrary.wiley.com
January 1, 2026 at 1:00 PM
Our new theoretical paper on combinatory tool use origins is out !
with @raccoonologist.bsky.social
onlinelibrary.wiley.com/doi/epdf/10....
with @raccoonologist.bsky.social
onlinelibrary.wiley.com/doi/epdf/10....
Reposted by Jeroen Zewald
I had the honour of working to bring @auersperga.bsky.social’s baby to life. It’s a VERY heavy baby - over 200 references (and yes I read them all) - but necessary to do justice to our new hypothesis of combinatory tool use origins 📝👶🛠️
onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com/doi/10.1002/...
The flexible, the stereotyped and the in‐between: putting together the combinatory tool use origins hypothesis
Tool use research has long made the distinction between tool using that is considered learned and flexible, and that which appears to be instinctive and stereotyped. However, animals with an inherite...
onlinelibrary.wiley.com
December 31, 2025 at 9:16 AM
I had the honour of working to bring @auersperga.bsky.social’s baby to life. It’s a VERY heavy baby - over 200 references (and yes I read them all) - but necessary to do justice to our new hypothesis of combinatory tool use origins 📝👶🛠️
onlinelibrary.wiley.com/doi/10.1002/...
onlinelibrary.wiley.com/doi/10.1002/...
Reposted by Jeroen Zewald
How do curiosity and surprise intersect following a violation of expectation? Read our paper here🔥
@auersperga.bsky.social @ivojacobs.bsky.social @elifduran.bsky.social
@auersperga.bsky.social @ivojacobs.bsky.social @elifduran.bsky.social
Physio-behavioral manifestations of 'surprise' in two parrot species: kea (Nestor notabilis) and Goffin's cockatoos (Cacatua goffiniana): doi.org/10.1098/rsos... #RSOS #cognition
December 29, 2025 at 11:37 PM
How do curiosity and surprise intersect following a violation of expectation? Read our paper here🔥
@auersperga.bsky.social @ivojacobs.bsky.social @elifduran.bsky.social
@auersperga.bsky.social @ivojacobs.bsky.social @elifduran.bsky.social
Reposted by Jeroen Zewald
Looking for a Postdoc position and have a background in bioacoustics and animal cognition? Interested in whether other animals might have something akin to language? Join our team: www.oeaw.ac.at/en/oeaw-home...
December 19, 2025 at 2:08 PM
Looking for a Postdoc position and have a background in bioacoustics and animal cognition? Interested in whether other animals might have something akin to language? Join our team: www.oeaw.ac.at/en/oeaw-home...
Reposted by Jeroen Zewald
Looking for a PhD at the intersection of animal cognition, acoustics & machine learning?
We offer 3 PhD projects at the Acoustics Research Institute (Vienna) and IT:U Linz:
Info: it-u.at/en/research/...
Apply: career.it-u.at/en/Job/73280
Deadline: Jan 31, 2026 | Start: Mar 2026
We offer 3 PhD projects at the Acoustics Research Institute (Vienna) and IT:U Linz:
Info: it-u.at/en/research/...
Apply: career.it-u.at/en/Job/73280
Deadline: Jan 31, 2026 | Start: Mar 2026
it-u.at
December 2, 2025 at 7:01 PM
Looking for a PhD at the intersection of animal cognition, acoustics & machine learning?
We offer 3 PhD projects at the Acoustics Research Institute (Vienna) and IT:U Linz:
Info: it-u.at/en/research/...
Apply: career.it-u.at/en/Job/73280
Deadline: Jan 31, 2026 | Start: Mar 2026
We offer 3 PhD projects at the Acoustics Research Institute (Vienna) and IT:U Linz:
Info: it-u.at/en/research/...
Apply: career.it-u.at/en/Job/73280
Deadline: Jan 31, 2026 | Start: Mar 2026
Reposted by Jeroen Zewald
Vienna dog owners! Clever Dog Lab researchers and I have new study for your pups to participate in😊
Only need one visit to the lab to play with their favorite toy😍
Email to participate today! Rita.goetz@vetmeduni.ac.at
@asommese.bsky.social
Only need one visit to the lab to play with their favorite toy😍
Email to participate today! Rita.goetz@vetmeduni.ac.at
@asommese.bsky.social
November 25, 2025 at 7:00 PM
Vienna dog owners! Clever Dog Lab researchers and I have new study for your pups to participate in😊
Only need one visit to the lab to play with their favorite toy😍
Email to participate today! Rita.goetz@vetmeduni.ac.at
@asommese.bsky.social
Only need one visit to the lab to play with their favorite toy😍
Email to participate today! Rita.goetz@vetmeduni.ac.at
@asommese.bsky.social
Reposted by Jeroen Zewald
second PhD position is on social and ecological cognition in wild Assamese macaques at our long-term field site in the beautiful Phu Khieo Wildlife Sanctuary, Thailand
👉 tinyurl.com/ypefnbxp
⏰ deadline 20 Dec 2025
👉 tinyurl.com/ypefnbxp
⏰ deadline 20 Dec 2025
Stellenanzeigen - Georg-August-University Göttingen
Website of the Georg-August-University Göttingen
tinyurl.com
November 25, 2025 at 8:25 PM
second PhD position is on social and ecological cognition in wild Assamese macaques at our long-term field site in the beautiful Phu Khieo Wildlife Sanctuary, Thailand
👉 tinyurl.com/ypefnbxp
⏰ deadline 20 Dec 2025
👉 tinyurl.com/ypefnbxp
⏰ deadline 20 Dec 2025
Reposted by Jeroen Zewald
First PhD position is on the evolutionary basis of empathy using infrared thermography in Barbary macaques at Affenberg Salem, southern Germany
👉 tinyurl.com/2e8wzkfz
⏰ deadline 20 Dec 2025
👉 tinyurl.com/2e8wzkfz
⏰ deadline 20 Dec 2025
Stellenanzeigen - Georg-August-Universität Göttingen
Webseiten der Georg-August-Universität Göttingen
tinyurl.com
November 25, 2025 at 8:25 PM
First PhD position is on the evolutionary basis of empathy using infrared thermography in Barbary macaques at Affenberg Salem, southern Germany
👉 tinyurl.com/2e8wzkfz
⏰ deadline 20 Dec 2025
👉 tinyurl.com/2e8wzkfz
⏰ deadline 20 Dec 2025
Reposted by Jeroen Zewald
We kindly invite every PhD candidate to present their research to the CoBeNe community at the PhD academy. It is an excellent opportunity to practice presenting in a friendly environment and receive input on the topic.
Abstract Submission Deadline: 01.12.2025!
ufind.univie.ac.at/en/course.ht...
Abstract Submission Deadline: 01.12.2025!
ufind.univie.ac.at/en/course.ht...
November 26, 2025 at 9:28 AM
We kindly invite every PhD candidate to present their research to the CoBeNe community at the PhD academy. It is an excellent opportunity to practice presenting in a friendly environment and receive input on the topic.
Abstract Submission Deadline: 01.12.2025!
ufind.univie.ac.at/en/course.ht...
Abstract Submission Deadline: 01.12.2025!
ufind.univie.ac.at/en/course.ht...
Reposted by Jeroen Zewald
Application deadline this Wednesday!!🦜
November 24, 2025 at 3:20 PM
Application deadline this Wednesday!!🦜
Reposted by Jeroen Zewald
📢 #Ethology2026 – A Double Event
Join us for:
• Ethologische Gesellschaft Annual Meeting, 18–21 Feb, Grünau
• DK Symposium: Cognition & Communication, 23–24 Feb, Vienna
A full week of ethology, cognition, and communication.
univie.eventsair.com/etho26-dkcog...
@ethoges.bsky.social @univie.ac.at
Join us for:
• Ethologische Gesellschaft Annual Meeting, 18–21 Feb, Grünau
• DK Symposium: Cognition & Communication, 23–24 Feb, Vienna
A full week of ethology, cognition, and communication.
univie.eventsair.com/etho26-dkcog...
@ethoges.bsky.social @univie.ac.at
November 17, 2025 at 12:47 PM
📢 #Ethology2026 – A Double Event
Join us for:
• Ethologische Gesellschaft Annual Meeting, 18–21 Feb, Grünau
• DK Symposium: Cognition & Communication, 23–24 Feb, Vienna
A full week of ethology, cognition, and communication.
univie.eventsair.com/etho26-dkcog...
@ethoges.bsky.social @univie.ac.at
Join us for:
• Ethologische Gesellschaft Annual Meeting, 18–21 Feb, Grünau
• DK Symposium: Cognition & Communication, 23–24 Feb, Vienna
A full week of ethology, cognition, and communication.
univie.eventsair.com/etho26-dkcog...
@ethoges.bsky.social @univie.ac.at
Reposted by Jeroen Zewald
July 9, 2025 at 3:57 PM
Reposted by Jeroen Zewald
Hi everyone, happy to share with all of you the paper from the second chapter of my PhD, where we show that more exploratory birds use a broader foraging niche, linking consistent behavior with ecological flexibility. I hope you can enjoy it and share it!!!
onlinelibrary.wiley.com/doi/10.1111/...
onlinelibrary.wiley.com/doi/10.1111/...
Exploration Behavior Is Consistent and Associated With Foraging Behavior in Island Songbirds
We tested the neophobia threshold hypothesis in six landbird species, including four Darwin's finches. Exploration behavior was consistent over time and contexts, with species exhibiting greater fora....
onlinelibrary.wiley.com
July 10, 2025 at 3:13 PM
Hi everyone, happy to share with all of you the paper from the second chapter of my PhD, where we show that more exploratory birds use a broader foraging niche, linking consistent behavior with ecological flexibility. I hope you can enjoy it and share it!!!
onlinelibrary.wiley.com/doi/10.1111/...
onlinelibrary.wiley.com/doi/10.1111/...
Reposted by Jeroen Zewald
We're hiring📢📢📢
To complement our team we're currently looking for a postdoctoral researcher with expertise in animal communication and behaviour, ideally canids but not a must! Position is based in Vienna, Austria, and available for 4 years. Please check the attachment for details 🐺🐶😊
To complement our team we're currently looking for a postdoctoral researcher with expertise in animal communication and behaviour, ideally canids but not a must! Position is based in Vienna, Austria, and available for 4 years. Please check the attachment for details 🐺🐶😊
June 23, 2025 at 12:26 PM
We're hiring📢📢📢
To complement our team we're currently looking for a postdoctoral researcher with expertise in animal communication and behaviour, ideally canids but not a must! Position is based in Vienna, Austria, and available for 4 years. Please check the attachment for details 🐺🐶😊
To complement our team we're currently looking for a postdoctoral researcher with expertise in animal communication and behaviour, ideally canids but not a must! Position is based in Vienna, Austria, and available for 4 years. Please check the attachment for details 🐺🐶😊
Reposted by Jeroen Zewald
Lovebirds have begun to use air conditioning in buildings in Phoenix, only during the hottest months and when the temperature approaches the maximum they can tolerate.
(paper, 2021) royalsocietypublishing.org/doi/full/10....
vía @zewaldj.bsky.social
(blog) www.forbes.com/sites/grrlsc...
(paper, 2021) royalsocietypublishing.org/doi/full/10....
vía @zewaldj.bsky.social
(blog) www.forbes.com/sites/grrlsc...
June 21, 2025 at 5:47 PM
Lovebirds have begun to use air conditioning in buildings in Phoenix, only during the hottest months and when the temperature approaches the maximum they can tolerate.
(paper, 2021) royalsocietypublishing.org/doi/full/10....
vía @zewaldj.bsky.social
(blog) www.forbes.com/sites/grrlsc...
(paper, 2021) royalsocietypublishing.org/doi/full/10....
vía @zewaldj.bsky.social
(blog) www.forbes.com/sites/grrlsc...
Reposted by Jeroen Zewald
PhD positions in bird cognition and behavior at the University of Hong Kong are open for motivated candidates. Applicants should have a biology background. Apply to Dr. Simon Sin at sinyw@hku.hk. More info: www.simonywsin.com. #phd
June 19, 2025 at 11:25 PM
PhD positions in bird cognition and behavior at the University of Hong Kong are open for motivated candidates. Applicants should have a biology background. Apply to Dr. Simon Sin at sinyw@hku.hk. More info: www.simonywsin.com. #phd
Reposted by Jeroen Zewald
We are looking for a Research Assistant to contribute to our ongoing analysis of dolphin acoustic data from West Wales - collaboration between @wtsww.bsky.social @bristolbiosci.bsky.social 🐬
Deadline is 29th June - please share widely!
www.bristol.ac.uk/jobs/find/de...
Deadline is 29th June - please share widely!
www.bristol.ac.uk/jobs/find/de...
Details | Working at Bristol | University of Bristol
www.bristol.ac.uk
June 15, 2025 at 6:20 PM
We are looking for a Research Assistant to contribute to our ongoing analysis of dolphin acoustic data from West Wales - collaboration between @wtsww.bsky.social @bristolbiosci.bsky.social 🐬
Deadline is 29th June - please share widely!
www.bristol.ac.uk/jobs/find/de...
Deadline is 29th June - please share widely!
www.bristol.ac.uk/jobs/find/de...
Reposted by Jeroen Zewald
Cockatoos have learned to operate drinking fountains in Australia.
The behavior—never before seen in birds—may be a developing cultural tradition among one population: scim.ag/4kIi12G
The behavior—never before seen in birds—may be a developing cultural tradition among one population: scim.ag/4kIi12G
June 7, 2025 at 2:08 PM
Cockatoos have learned to operate drinking fountains in Australia.
The behavior—never before seen in birds—may be a developing cultural tradition among one population: scim.ag/4kIi12G
The behavior—never before seen in birds—may be a developing cultural tradition among one population: scim.ag/4kIi12G
Reposted by Jeroen Zewald
Did you know that riflebirds are the only known bird with “double jointed” wrists?
It’s a nice example of how sexual selection can mess with the bodies of males (and females) to accommodate unusual displays
Read more about these spectacular displays here:
doi.org/10.1093/biol...
It’s a nice example of how sexual selection can mess with the bodies of males (and females) to accommodate unusual displays
Read more about these spectacular displays here:
doi.org/10.1093/biol...
The mechanics of male courtship display behaviour in the Ptiloris riflebirds (Aves: Paradisaeidae)
Abstract. Sexual selection through female choice has driven the evolution of some of the most elaborate signalling behaviours in animals. These displays of
doi.org
June 7, 2025 at 2:16 PM
Did you know that riflebirds are the only known bird with “double jointed” wrists?
It’s a nice example of how sexual selection can mess with the bodies of males (and females) to accommodate unusual displays
Read more about these spectacular displays here:
doi.org/10.1093/biol...
It’s a nice example of how sexual selection can mess with the bodies of males (and females) to accommodate unusual displays
Read more about these spectacular displays here:
doi.org/10.1093/biol...
Reposted by Jeroen Zewald
Our paper on brain size evolution in birds of paradise was recently accepted!
In brief:
•BoPs have big brains, comparable to those of medium-sized corvids
•Neither absolute nor relative brain size appears to have co-evolved with display complexity
doi.org/10.1093/orni...
In brief:
•BoPs have big brains, comparable to those of medium-sized corvids
•Neither absolute nor relative brain size appears to have co-evolved with display complexity
doi.org/10.1093/orni...
Did complex song and dance co-evolve with brain size in the birds-of-paradise (Aves: Paradisaeidae)?
Abstract. Complex signaling behaviors, such as avian song and courtship displays, have been associated with increases in both absolute and relative brain s
doi.org
June 6, 2025 at 9:39 PM
Our paper on brain size evolution in birds of paradise was recently accepted!
In brief:
•BoPs have big brains, comparable to those of medium-sized corvids
•Neither absolute nor relative brain size appears to have co-evolved with display complexity
doi.org/10.1093/orni...
In brief:
•BoPs have big brains, comparable to those of medium-sized corvids
•Neither absolute nor relative brain size appears to have co-evolved with display complexity
doi.org/10.1093/orni...
Reposted by Jeroen Zewald
🎊Fully funded PhD position on cooperative sustainability🌳
Are you curious about
🧒 developmental,
🌍 cross-cultural
🦧 species comparative
research on cooperative sustainability?
All info here or dm me with questions!
career2.successfactors.eu/sfcareer/job...
Please share! 🙏
Are you curious about
🧒 developmental,
🌍 cross-cultural
🦧 species comparative
research on cooperative sustainability?
All info here or dm me with questions!
career2.successfactors.eu/sfcareer/job...
Please share! 🙏
Career Opportunities: PhD position Cooperative Sustainability (14208)
career2.successfactors.eu
June 5, 2025 at 9:27 AM
🎊Fully funded PhD position on cooperative sustainability🌳
Are you curious about
🧒 developmental,
🌍 cross-cultural
🦧 species comparative
research on cooperative sustainability?
All info here or dm me with questions!
career2.successfactors.eu/sfcareer/job...
Please share! 🙏
Are you curious about
🧒 developmental,
🌍 cross-cultural
🦧 species comparative
research on cooperative sustainability?
All info here or dm me with questions!
career2.successfactors.eu/sfcareer/job...
Please share! 🙏
Reposted by Jeroen Zewald
NEW EPISODE 📣
To study animals in the wild you have to find the animals & build a research "villa" before you even start the science
@mohara.bsky.social & @bmioduszewska.bsky.social took on this challenge to study wild Goffin's cockatoos on a small Indonesian island
Photos: Goffin lab Tanimbar
To study animals in the wild you have to find the animals & build a research "villa" before you even start the science
@mohara.bsky.social & @bmioduszewska.bsky.social took on this challenge to study wild Goffin's cockatoos on a small Indonesian island
Photos: Goffin lab Tanimbar
June 4, 2025 at 12:14 PM
NEW EPISODE 📣
To study animals in the wild you have to find the animals & build a research "villa" before you even start the science
@mohara.bsky.social & @bmioduszewska.bsky.social took on this challenge to study wild Goffin's cockatoos on a small Indonesian island
Photos: Goffin lab Tanimbar
To study animals in the wild you have to find the animals & build a research "villa" before you even start the science
@mohara.bsky.social & @bmioduszewska.bsky.social took on this challenge to study wild Goffin's cockatoos on a small Indonesian island
Photos: Goffin lab Tanimbar
Reposted by Jeroen Zewald
1/2 Sidney's cockatoos have learned to use drinking fountains
It's a tricky mechanism that requires turning and holding a handle.
They've figured out how to do it using their own weight,
and now it's cultural : )
(paper) royalsocietypublishing.org/doi/full/10....
by @lucymaplin.bsky.social
It's a tricky mechanism that requires turning and holding a handle.
They've figured out how to do it using their own weight,
and now it's cultural : )
(paper) royalsocietypublishing.org/doi/full/10....
by @lucymaplin.bsky.social
June 11, 2025 at 6:40 PM
1/2 Sidney's cockatoos have learned to use drinking fountains
It's a tricky mechanism that requires turning and holding a handle.
They've figured out how to do it using their own weight,
and now it's cultural : )
(paper) royalsocietypublishing.org/doi/full/10....
by @lucymaplin.bsky.social
It's a tricky mechanism that requires turning and holding a handle.
They've figured out how to do it using their own weight,
and now it's cultural : )
(paper) royalsocietypublishing.org/doi/full/10....
by @lucymaplin.bsky.social
Reposted by Jeroen Zewald
Why did some birds evolve to be so clever? Mark O'Hara & Berenika Mioduszewska took on the challenge of studying wild Goffin's cockatoos on a small Indonesian island.
Their exciting findings help answer that question.
Listen: linktr.ee/wild_behavior_pod
Photo: Goffin Lab Tanimbar
Their exciting findings help answer that question.
Listen: linktr.ee/wild_behavior_pod
Photo: Goffin Lab Tanimbar
June 13, 2025 at 12:53 PM
Why did some birds evolve to be so clever? Mark O'Hara & Berenika Mioduszewska took on the challenge of studying wild Goffin's cockatoos on a small Indonesian island.
Their exciting findings help answer that question.
Listen: linktr.ee/wild_behavior_pod
Photo: Goffin Lab Tanimbar
Their exciting findings help answer that question.
Listen: linktr.ee/wild_behavior_pod
Photo: Goffin Lab Tanimbar