TRUE: Both male and female walruses have extended tusks.
TRUE: Walruses can slow their heartbeat while diving underwater to keep warm.
FALSE: To maximize the ratio of insulating blubber to body size, walruses have a lower blood volume than most land animals their size.
Because walruses spend so much time underwater, they store oxygen in their blood and muscles. They actually have an enormous blood volume–two to three times as much as other land animals their size. Do you know any interesting ways other animals have adapted to their surroundings?