Some Killer Whales Hunt Only Fish

Live ScienceThe current issue of Live Science includes a fascinating article by staff writer Tia Ghose on a killer whale study that indicates some pods of killer whales or orcas hunt only fish, primarily salmon, while others hunt exclusively seals, walruses, sea lions and whales. The mammal-hunters do not intermix or interbreed with the fish-hunters, the scientists say. And the mammal-hunters have learned to “go dark”: they hunt in silence, listening for their prey to surface and breath–read the whole story at