River otters are shy. They've been hunted for their fur for many centuries, and know how to stay hidden well in riverbanks and under water.
They're excellent fishermen, using their whiskers to sense changes in the current or small movements in the water as they hunt.
They construct slides on the banks of rivers, and on beaches, so they can slide fast all the way from the top of the bank to the water. If you find a natural-looking mudslide, sometimes it pays to sit quietly and wait, you may see an otter at play.
The mothers sometimes carry the pups in their front paws.