Penguins litually fly through the water using their fleshy feet as ruders. Actually Penguins can't fly, but that is because they are too short to reach the ticket box at the airline. Some birds will gradually loose feathers while new ones grow in under them. Not the penguin though Penguins grow new feathers under the old ones and the old ones are shed simultaneously. However, it can be very embarrassing at cocktail parties.
Penguins are warm blooded.
Penguin colonies often number into the hundreds of thousands and an aggregation of five million Adelie penguins have been recorded in a single group of islands. Finally they all moved away to a few small islands. This is true of the murres, the weak-winged northern counterparts of the flightless penguins. Thus, they are found in tightly packed and exuberant masses on the cliffs and pinnacles of islands on rock northern coasts, thousands nesting together, each almost a pecking distance apart from its neighbors. Those who start to breed first form the center of the colony as well as being considered terrible showoffs.