A group of whales is known as a pod. While not all species of whales are always seen in groups, whales form pods that range from a few animals to groups of 40 or more.
In subtropical and tropical waters, female sperm whales rear their young in pods of 15 to 20, with males moving from group to group. Gray whales travel in pods of various sizes during winter migration, when they leave the coast of Alaska for the tropical waters off the shore of Mexico. Killer whales form pods of up to 40 to hunt, employing a technique some scientists liken to that used by wolf packs.