Mai Lam/The Conversation NY-BD-CC
Sea otters can break the shell on a shellfish by hitting it against a stone resting on their belly. This can look like clapping. Some even have a favourite stone they carry around in their armpits.
New research suggests otters' learning ability could help captive animals to thrive in the wild.
Great white photobomb.
George T. Probst/NOAA/Flickr
The world's oceans are home to innumerable life forms, from sponges to sea lions, and scientists have many creative ways of studying them.
A sea otter floats in Kachemak Bay, Alaska.
AP Photo/Laura Rauch
Sea otters had been absent from this Alaskan national park for at least 250 years. By marrying math and statistics, scientists map this animal's successful comeback.
School of thought.
Understanding this will boost conservation efforts.