The edges of the beak are sharp and have rough spines in the inside to help them hold onto the slippery fish they catch under water. The beak is strong and is used to carry materials for nest building. Penguins use their beaks for feeding their young. The beak is used to preen their feathers and to spread the oil to keep them waterproof. Penguins use there sharp beaks for protecting itself and its young.
Most flying birds have short, sharp beaks for picking up seeds and carrying nesting material.
Penguins have two thick layers of feathers to keep them warm. They have an outer layer of thick, overlapping feathers that have a waxy oil that makes them waterproof when they are in the water. Under this layer is a thick fluffy layer of down that mixes with air to keep body heat in and cold air out. Penguins also have a thick layer of blubber that gives them warmth and insulation. The penguins feathers cover their plump bodies making its look like a thick fur coat.