Yeah, that's a good point. Kind of contradictory of me to say humans are arrogant to pretend to know what animals are thinking and then say myself that animals don't kill for sheer pleasure. So I can't say this for sure, because I don't know.
By "I don't know of" I mean, I haven't observed it, or rather more specifically, I haven't observed behavior that is similar, but I'm still a student of this field of knowledge. I'm not saying it doesn't happen. The chihuahua example above from mrbgty is a curious case. It is interesting though that chihuahuas are an invention of man, bred by man with certain personality traits that may not exist in the wild outside such human influence. Of course there could be myriad examples of it we (I) am not aware of, because we can't read their minds. I'd love to be able to read animal minds though, how awesome would that be?!
I'm no zoologist of course. I did watch a lot of Nature on PBS and that sort of thing, but definitely no expert. Mostly I just find it a fascinating question of what really separates man and animal.
By "I don't know of" I mean, I haven't observed it, or rather more specifically, I haven't observed behavior that is similar, but I'm still a student of this field of knowledge. I'm not saying it doesn't happen. The chihuahua example above from mrbgty is a curious case. It is interesting though that chihuahuas are an invention of man, bred by man with certain personality traits that may not exist in the wild outside such human influence. Of course there could be myriad examples of it we (I) am not aware of, because we can't read their minds. I'd love to be able to read animal minds though, how awesome would that be?!
As far as my knowledge, just what biology classes I have taken and reading some books like Darwin's expression of emotions in man and animal. Good read, many versions here: http://books.google.com/books?q=editions:ISBN1417958944&...
I'm no zoologist of course. I did watch a lot of Nature on PBS and that sort of thing, but definitely no expert. Mostly I just find it a fascinating question of what really separates man and animal.