1. Sea otters have a remarkable ability to use tools. They have been observed using rocks as hammers to crack open shells of their prey, such as clams and mussels. They even have a favorite rock that they keep in a special pocket of fur.

2. Sea otters are avid groomers and spend a significant amount of time each day ensuring their fur remains clean and well-maintained. They use their forepaws and teeth to comb through their fur, which helps to keep it insulated and buoyant.

3. Unlike most marine mammals, sea otters lack a layer of blubber to keep them warm in cold waters. Instead, their dense fur acts as an effective insulator, keeping their body temperature regulated.

4. Sea otters are among the few mammals capable of giving birth in water. They typically give birth to a single pup, and the mother takes great care to groom and nurture her young, often seen cradling them on her chest.

5. Sea otters have incredibly fast metabolisms, which means they need to eat a lot of food to sustain their energy levels. In fact, they consume approximately 25% of their body weight in food each day.

6. They have specialized back molars that are perfectly adapted for crushing and grinding the hard shells of their prey. These teeth are unique among marine mammals and play a crucial role in their diet.

7. Sea otters have pockets of loose skin under their forearms, which they use as a convenient "food pouch." When foraging, they store their collected food, such as crabs or sea urchins, in these pouches before returning to the surface.

8. Sea otters have a remarkable lung capacity that allows them to hold their breath for long periods underwater. They can stay submerged for up to five minutes while foraging or resting.

9. They are highly social creatures and often form groups called rafts, consisting of dozens or even hundreds of individuals. Rafts provide protection, companionship, and communal grooming opportunities for sea otters.

10. Sea otters have a unique method of keeping their fur insulated and buoyant. They trap a layer of air in their dense fur, which enhances their natural buoyancy and helps them stay afloat while resting or sleeping.