Social structure of killer whales (Orcinus orca) in a variable low‐latitude environment, the Galápagos Archipelago

Killer whales ( Orcinus orca ) have strong social matrilineal bonds and form groups and long‐lasting associations, but little is known about their population or social structure in an equatorial setting such as the waters around the Galápagos Islands. Using 91 encounters and identification photographs from 1991 to 2017, we identified 64 killer whales of which 18 individuals were locals with high resighting rates. Group size was small, ranging...