Orca (Orcinus orca)

Considered an apex predator of the open ocean, orca are aptly nicknamed “killer whales”. They are the largest members of the dolphin family, and just like other dolphins, are highly social. Orca hunt together in close family groups of roughly six whales that never separate from each other for longer than several hours. Each pod, or group, is matriarchal, being led by the oldest female and is led by her until she dies - being then replaced by the oldest daughter. Different pods tend to specialize on one type of prey each. For instance, northern orca will often prey upon mammals, while others will focus on eating large quantities of fish. There are even accounts of groups that have hunted moose and other whales. They have been historically kept in captivity by humans, but the extent of their social capabilities has deemed this practice very unethical.