As I said in my last book, birds are mean. They're the only pet that, when they escape, the owners are relieved. You can tell a species is evil by doing this simple math. If my blond lab Molly was the size of T-Rex, that would just mean more kibble, more work for the gardener in the backyard, and a harder time moving her to my wife's side of the bed at night. If birds were the size of a T-Rex, the streets would be littered with human remains.
Adam Carolla