Wild monkeys do eat bananas, but the bananas that monkeys are fed in zoos are cultivated for humans to have more sugar. These bananas are just too sweet for primates. Head of Conservation and Advocacy at the Paignton Zoo, Dr. Amy Plowman, says that giving the bananas to monkeys is like feeding them cake or chocolate.
They have nostrils called blowholes. Over millions of years of evoloution whales and dolphins nostrils moved to the top of their head. This allows them to breath by surfacing instead of them sticking their whole head out of the water. The first thing a newborn dolphin must do is to go to the surface to breathe.