
In spring, Sealions gather at breeding areas called “rookeries”. Males arrive in May, staking out territories before the females come ashore. When the females arrive, they are herded into a bull’s territory to form a “harem” – a group of about
15 or more females. Soon after they arrive, females give birth to a pup conceived the previous year.
The pups remain with their mother for about one year but often gather in groups with the other pups to play and engage in mock battles. When pups are a year old, they are called “yearlings.”

