Homo sapiens - If any member of this fur-impaired two-legged species were still alive, it would no doubt take offense at being so far down on the list, which is not exactly in chronological order. Although it often exhibited an exceptional capacity for intelligence (it was the only species Earth produced capable of reading this obit), the human race often failed to use it, falling for extra bacon as a popular inducement to clog the amazing muscle known as the heart, maiming and killing each other over trivial differences no dog would ever take offense to, cats excepted, and creating legends to justify a hyperinflated sense of species superiority.