Background Walruses live in the Arctic where temperatures average -30'C (-22'F) in January over the pack ice. Walruses have a thick layer of fat, called blubber, under their skin to help keep them warm.
(temperatures average -30'C (-22'F) in January over the pack ice. Walruses; have; a thick layer of fat, called blubber, under their skin) (a thick layer of fat; called; blubber)
temperatures average -30'C (-22'F) in January over the pack ice. Walruses a thick layer of fat
have called
a thick layer of fat, called blubber, under their skin
blubber