|© Ansgar Walk (via Wikimedia Commons)|
Male walruses can also make a knocking sound from their foreheads, which is unusual because no air is released when they make the sound. Researchers aren't yet sure how they do it.
The moms teach their young how to communicate, and this is extremely important for the health and well-being of the developing walrus calf. Researchers who have studied walruses in captivity have observed that, without that socialization, babies do not eat or grow properly.
You can hear walrus sounds for yourself at the Western Soundscape Library.