Resident orcas live in two major groups, one in the waters of the south island and one in the north, while a third group of transient orcas roam much farther and avoid the resident orcas. Residents are watched from a distance and are numbered, with many being named as well. Humpback whales and gray whales are often seen on their migration between Alaskan waters where they feed in the summer and southern waters such as around California and Mexico where they give birth in the winter.