Predators are sea lions, sharks, and walruses
Man was the biggest one
Any place where their food (mostly fish) is abundant and there is a place with few predators to hunt while they reproduce. The biggest predators of most penguins are like killer whales - in the water. With that in mind, on top of the fact that penguins have evolved to stay warm in cold climates, penguins have a comfortable niche in the arctic and antarctic.
turtles
of course. they are birds they do have predators. foxes, cats, people at KFC. all birds have predators. eagles, emus, penguins. and most of all even they biggest birds are prey for man :(
lepeord seals
fish
No. Nocturnal activity is for most animals a way to avoid predators. Penguins don't have predators on land, so they rest at night.
To keep predators away
Leopard seals.
killer whales
Leopard seals.
by making a wierd piercing noise to warn other penguins