At least 60 different species, including spiders, birds, mice, fish, insects and primates, among others, have been found to have distinct personalities in the last few years.
http://abcnews.go.com/Technology/story?id=3249831&page=1&CMP=OTC-RSSFeeds0312
http://abcnews.go.com/Technology/story?id=3249831&page=1&CMP=OTC-RSSFeeds0312