There is in all animals a sense of duty that man condescends to call instinct. – Robert Brault, rbrault.blogspot.com

We know what the animals do, what are the needs of the beaver, the bear, the salmon, and other creatures, because long ago men married them and acquired this knowledge from their animal wives. Today the priests say we lie, but we know better. – American Indian Proverb

What an ugly beast the ape, and how like us. – Marcus Tullius Cicero

Drinking, when we are not thirsty and making love all year round, madam; that is all there is to distinguish us from other animals. – Pierre De Beaumarchais