We are part of the animal kingdom...

You can say any foolish thing to a dog, and the dog will give you a look that says, 'Wow, you're right! I never would've thought of that!' - Dave Barry
Dog, like this one, barks but would immediately retreat when challenged. Some animals, like these 3 well known monkeys, are sworn to 'hear no evil, see no evil and speak no evil'.

This greedy one will even take you as breakfast!