no they do not
You can use binoculars to see otters. You can also see them through your camera lens
No if you use your senses it is a physical change
the otters use their paws to swim fast away from predators
They use it to catch fish
swim and look after there young
they bite
claws
oyster shells
The plural of otter is otters.
The use of the senses to gather information is known as sensory perception.
sight