http://www.sciencespacerobots.com/scient...x-10520171
EXCERPT: Chickens are the world's most abundant domestic animal. There are tens of billions of them worldwide. Chickens are not known for being smart but scientists say they definitely are not the clueless "bird brains" some people think they are. Researchers says chickens have distinct personalities. They also say chickens are behaviorally, cognitively and emotionally complex individuals. Lori Marino [...] "They are perceived as lacking most of the psychological characteristics we recognize in other intelligent animals and are typically thought of as possessing a low level of intelligence compared with other animals. The very idea of chicken psychology is strange to most people...."
Thinking chickens: a review of cognition, emotion, and behavior in the domestic chicken
http://link.springer.com/article/10.1007...016-1064-4
EXCERPT: Chickens are the world's most abundant domestic animal. There are tens of billions of them worldwide. Chickens are not known for being smart but scientists say they definitely are not the clueless "bird brains" some people think they are. Researchers says chickens have distinct personalities. They also say chickens are behaviorally, cognitively and emotionally complex individuals. Lori Marino [...] "They are perceived as lacking most of the psychological characteristics we recognize in other intelligent animals and are typically thought of as possessing a low level of intelligence compared with other animals. The very idea of chicken psychology is strange to most people...."
Thinking chickens: a review of cognition, emotion, and behavior in the domestic chicken
http://link.springer.com/article/10.1007...016-1064-4