The mental abilities of animals—particularly birds—have traditionally 
been underestimated. However, as we take the time to study what birds are really 
like, their intelligence and complex lives become very obvious.
Here’s what the experts say about chickens: 
Dr. Lesley Rogers, Professor of Zoology at 
University of New England, Australia 
“[I]t is now clear that birds have cognitive capacities equivalent to those 
of mammals, even primates.” 
Rogers LJ, The Development of Brain and Behaviour in 
the Chicken (Wallingford, Oxon, U.K.: CABI Publishing, 1995, p. 217). 
Dr. Joy Mench, Professor of Animal Science 
at University of California at Davis 
“Dr. Joy Mench, Professor and Director of the Center for Animal Welfare at 
the Univ. of Calif. at Davis explains, ‘Chickens show sophisticated social 
behavior….That’s what a pecking order is all about. They can recognize more than 
a hundred other chickens and remember them. They have more than thirty types of 
vocalizations.’” 
Specter M, “The Extremist,” The New Yorker, April 
14, 2003, p. 64. 
Dr. Chris Evans, Professor of Psychology 
at Macquarie University, Australia 
“Chickens exist in stable social groups. They can recognize each other by 
their facial features. They have 24 distinct cries that communicate a wealth of 
information to one other, including separate alarm calls depending on whether a 
predator is traveling by land or sea. They are good at solving problems. ‘As a 
trick at conferences I sometimes list these attributes, without mentioning 
chickens, and people think I’m talking about monkeys,’ Mr. Evans said. 
Perhaps most persuasive is the chicken’s intriguing ability to understand 
that an object, when taken away and hidden, nevertheless continues to exist. 
This is beyond the capacity of small children.” 
Grimes W, “If Chickens Are So Smart, Why Aren’t They 
Eating Us?” New York Times, January 12, 2003. 
Dr. Christine Nicol, Professor of 
Veterinary Science at Bristol University, England 
“‘They may be bird brains, but we need to redefine what we mean by bird 
brains,’ she told the British Association Festival of Science at Leicester 
University. ‘Chickens have shown us they can do things people didn’t think they 
could do. There are hidden depths to chickens, definitely.’” 
Ananova, “Chickens ‘Not Just Bird-Brains,’” 
September 11, 2002. http://www.ananova.com/news/story/sm_668673.html 
Dr. Bernard Rollin, Professor of Animal 
Science at Colorado State University 
“Contrary to what one may hear from the industry, chickens are not mindless, 
simple automata but are complex behaviorally, do quite well in learning, show a 
rich social organization, and have a diverse repertoire of calls. Anyone who has 
kept barnyard chickens also recognizes their significant differences in 
personality.” 
Rollin B, Farm Animal Welfare: School, Bioethical, 
and Research Issues (Iowa State University Press, 1995, p. 118). 
Source:  Compassion Over Killing
 
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