Many penguins live in icy areas near very cold seas. It's too cold for most plants to grow. So there are no seeds or berries for penguins to eat. No earthworms live in the ice. So these birds can't eat worms. But out in the sea food is everywhere. Penguins love to eat fish krill and squid. Penguins need their wings to swim after it. So they don't need to fly.