When it comes to sleep duration, walruses are like the bats of the sea, sleeping between 19.4 to 20.5 hours16 per day. They can sleep in water and on land, although they sleep for longer periods on land17.
How long can a walrus sleep?
The humble walrus can go for up to 84 hours without a wink of sleep, instead choosing to swim underwater and look for food. Don't be fooled though – after a big no-sleep bender a walrus can snooze for up to 19 hours to recover.
Which animal does not sleep at all?
Bullfrogs… No rest for the Bullfrog. The bullfrog was chosen as an animal that doesn't sleep because when tested for responsiveness by being shocked, it had the same reaction whether awake or resting. However, there were some problems with how the bullfrogs were tested.
