When push comes to shove, what is a fight?
UC creates effective way to decide whether to lump together similar animal behaviors
Biologists often study animal sociality by collecting observations about several types of behavioral interactions. These interactions can be things like severe fights, minor fights, cooperative food sharing, or grooming each other.
But to analyze animal behavior, researchers need to make decisions about how to categorize these interactions and how to code these behaviors during data collection. Turns out, this question can be complicated.
Researchers at the University of Cincinnati dug into this tricky question while studying monk parakeets. In new research, published in the journal Current Zoology, the team asked: How do you properly categorize two seemingly similar behaviors? The study was led by UC postdoctoral researcher Annemarie van der Marel who worked with UC doctoral students Sanjay Prasher, Claire O’Connell, and Chelsea Carminito and UC Assistant Professor Elizabeth Hobson.
“Biologists have to deal with this question: are the behaviors that we categorize as unique actually perceived as unique by the animals?” Hobson said. “How do the animals classify those behaviors?”
Biases can easily lead researchers astray in making these judgement calls. “If you look at chimpanzees, smiling is an aggressive behavior. But in humans, smiling is friendly,” said van der Marel. “The behaviors look similar to us but the nuances of how the behaviors are used are very different.”
Monk parakeets are highly social parrots that live in large colonies where they often interact with other individuals. The parakeets spend a large proportion of the day fighting, especially top-ranked birds, which makes it easy to distinguish them from birds ranked lower in the dominance hierarchy, said O’Connell. The birds demonstrate aggression in many ways. They bite, of course. But monk parakeets also like to take another parrot’s perch through menace or sheer force.
UC biologists observed two types of this “king of the hill” behavior: “displacements”, where one bird lunges at another bird and can bite to force that bird away, and “crowding”, where a threatened bird moves before an aggressor is within biting range. The team coded these behaviors as distinct because they appeared to differ in the level of aggression, with displacements appearing as a more severe form of aggression with a higher potential for injury. The parakeets also used these behaviors somewhat differently, with displacements occurring much more often than the crowding.
The question is: were these behaviors essentially used in the same ways by the birds, so that they could be treated as the same types of events in later analyses? Pooling two behaviors has major research benefits such as creating a richer dataset for future analyses. But pooling also carries a risk — by generalizing, scientists could be losing nuances of behaviors that convey important information when considered alone, Hobson said.
To get to the bottom of this question, the team turned to computational analysis. They created a new computer model that compared the real aggression patterns to ones that were randomized. This approach allowed the team to test whether treating the two behaviors as interchangeable caused any changes in the social structure. “On top of being a great lab bonding experience, it was an exciting opportunity to learn how to use simulations to help answer research questions” said Prasher.
In the UC study, their computational analysis supported pooling the two behaviors. For the UC team, these results will help them plan their future analyses as they work to understand the complex social lives of these parakeets. More broadly, van der Marel said the new framework can also help other animal-behavior researchers make informed and data-driven decisions about when to pool together behaviors and when to separate them.
Featured image at top: Monk parakeets. Photo/Michael Miller
Impact Lives Here
The University of Cincinnati is leading public urban universities into a new era of innovation and impact. Our faculty, staff and students are saving lives, changing outcomes and bending the future in our city's direction. Next Lives Here.
Stay up on all UC's COVID-19 stories, read more #UCtheGood content, or take a UC virtual visit and begin picturing yourself at an institution that inspires incredible stories.
Related Stories
UC alum finds success in a career spanning military service,...
November 4, 2024
Chelsea Lovelace, manager of cyber threat intelligence at leading defense contractor RTX, didn't always know what she wanted to do. Grappling with family tragedy, she entered community college after high school, but upon visiting University of Cincinnati, she fell in love with the campus. Today, with an undergraduate degree in Criminal Justice and a master's in IT—both from UC—she's excelled in roles with the National Guard, Cincinnati Police Department and now in the corporate world.
'Witch' casts a spell at The Carnegie this fall in partnership...
Event: November 14, 2024 7:30 PM
The Carnegie and University of Cincinnati College-Conservatory of Music (CCM) are joining forces this November for Jen Silverman’s "Witch." The play runs at The Carnegie in Covington, Kentucky, from Nov. 14-17, 2024.
UC joins as partner in prestigious Kern Entrepreneurial...
October 31, 2024
The University of Cincinnati’s College of Engineering and Applied Science is a new partner with the Kern Entrepreneurial Engineering Network, a coalition dedicated to equipping engineering students with an entrepreneurial mindset. This collaboration, supported by the Kern Family Foundation, empowers engineering programs to inspire curiosity, connections, and value creation in their graduates, preparing them to address real-world challenges with innovative solutions.