McDonald Lake, Glacier National Park, Montana, United States of America, North America

A group of five transient Orca (Orcinus orca) that chased, killed, and then ate a single Dall's porpoise (Phocoenoides dalli) in Icy Strait, Southeastern Alaska

An adult bull surfacing from a pod of 5 Orcas (Orcinus orca) encountered off Gardner Point on the south end of Admiralty Island, Southeast Alaska

An adult Orca tail-slapping from a pod of 6 Orcas (Orcinus orca) encountered off Sail Island and followed until McDonald Rocks in Frederick Sound, Southeast Alaska

An adult Orca tail-slapping from a pod of 6 Orcas (Orcinus orca) encountered off Sail Island and followed until McDonald Rocks in Frederick Sound, Southeast Alaska

Adult bull surfacing from a pod of 5 Orcas (Orcinus orca) encountered off Gardner Point on the south end of Admiralty Island, Southeast Alaska

A pod of 6 Orcas (Orcinus orca) encountered off Sail Island and followed until McDonald Rocks in Frederick Sound, Southeast Alaska

Detail of an adult Orca surfacing from a pod of 6 Orcas (Orcinus orca) encountered off Sail Island and followed until McDonald Rocks in Frederick Sound, Southeast Alaska

A pod of 6 Orcas (Orcinus orca) encountered off Sail Island and followed until McDonald Rocks in Frederick Sound, Southeast Alaska

LAKE MCDONALD, MONTANA/USA - SEPTEMBER 20 : View of Lake McDonald in Montana on September 20, 2013. Unidentified people