White-beaked dolphin, Lagenorhynchus albirostris.
The white-beaked dolphin, Lagenorhynchus albirostris although not a truly "arctic" mammal inhabits the pelagic zone in offshore waters of the eastern Arctic. Its name, albirostris, means "white snout" and refers to its distinctive, short, white beak. However, this is imprecise since the colour of the beak can vary from pale yellow to dark grey to mottled brown.
White-beaked dolphins have a thick layer of blubber to support their life in
cold arctic waters, where they feed largely on squid, hermit crabs, and fish.
These dolphins are powerful, fast swimmers that travel in groups ranging from
10 to 1500 individuals. At an average length of 2.52.8 m, white-beaked
dolphins are not much longer than a typical human male; yet, they weigh between
180 and 275 kg!