You have to check out 'March of the Penguins'. Penguins are the really ideal example of monogamy.
Rich LowryEven her pink bunny slippers seem to prick up their ears. Diary of a Penguin-napper (p. 15)
Diary of a Penguin-napper... Once a penguin finds its perfect other penguin, they stay together pretty much forever.
The Prank ListAlligators have beautiful undulating skin, which feels dense, spongy, solid, like the best eraser.
The Moon by Whale Light and Other Adventures Among Bats, Penguins, Crocodilians and Whales