Science news online has posted a nice summary of numerous recent studies showing that cat social organization is far more complex than previously thought.
When it comes to animal behavior research, there seems to be a strong bias against viewing animals as having any significant range of personalities or degree of emotional lives. From the sound of it I have to give the researchers in this article credit for being more open to these things than many others in the field.
If this sort of thing interests you, a couple of books that might interest you are "The Tribe of Tiger: Cats and Their Culture" by Elizabeth Marshall Thomas, and "When Elephants Weep: The Emotional Lives of Animals" by Jeffrey Mousaieff Masson.
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