Otters have a simple digestive system because there food travels down the esophagus from the mouth to eventually reach the stomach.

Otters also have strong stomach acid to help break down food that they have consumed into their body.

Otters have a very distinct habitat that they live at and they usually live near the shore water. Also, they may live where mud and sand are the primary sea-bottom substrates.

Sea otters are extremely social, and have a tendency to congregate in groups.

Otters catch there food with there claws and hold it with there paws when they are consuming it. They feed on fairly soft prey items such as small land vertebrates, frogs, and eggs.

For protection the otters come up to the kelp where they live for protection. They also have strong teeth they can use in interactions with other sea otters.

Otters are sexual mammals and most female otters don't reproduce until they are four years old.

After one month the pup can leave the holt and after two months it is able to swim. Otters live up to 16 years, and they are by nature playful and frolic in the water.

When a male sea otter sees a female sea otter the two engage in an aggressive and playful manner. Also, the male gasps the female nose into his teeth causing it to become swollen and bloody.

The central nervous system consists of the brain and the spinal cord in its body.

Otters have a very sharp sense of smell and it's really important because the otter is also to find its way back home.

The otters classification is a mammal because it's vertebrate and it doesn't produce young pups in an egg.