What does it mean to eat and sleep and fight peas?

This is a joke. A reporter visited Antarctica and saw a group of penguins. He asked them what they were doing every day. He asked the first one what you do every day. He said to eat, sleep and beat peas. He asked the second one, and he also said to eat, sleep and fight peas. Then he went on to ask several people what they said. When he asked the last one, he said to eat and sleep. Then the reporter wondered and asked him why you didn't fight peas. He said I was a pea.