Mammals

Most of our ancestors were not perfect ladies and gentlemen. The majority of them weren't even mammals.
Robert Anton Wilson
Ladies
Gentlemen
Majority
Mammals
However, further research has shown that it is the normal condition for humans and for most other mammals. It seems pretty clear why this is the case for most mammals and for most human beings.
Marvin Harris
Mammals
Pretty
Research
We already live a very long time for mammals, getting three times as many heartbeats as a mouse or elephant. It never seems enough though, does it?
David Brin
Time
Mammals
Mouse