River Otters (North America and Europe):
* Clams and Mussels: They use their powerful paws to pry open shells.
* Fish: They use a variety of techniques:
* Chasing and Catching: They pursue fish, using their streamlined bodies and powerful tails to swim swiftly.
* Diving and Stalking: They dive underwater, using their keen eyesight and sensitive whiskers to locate prey.
* "Tool Use": They sometimes use rocks to crack open shells or to dislodge prey from hiding spots.
* Other Prey: They also eat crabs, crayfish, frogs, and even small birds.
Sea Otters (Pacific Ocean):
* Sea Urchins, Crabs, and Mollusks: They use their strong front paws and claws to crack open shells.
* "Tool Use": They are famous for using rocks as tools to break open their prey, often holding a rock in their chest and smashing it against the shell.
* Floating on their Backs: They often float on their backs, using their bellies as a platform to hold food and use their paws to break open shells.
Common Techniques:
* Whiskers: Their long, sensitive whiskers act like radar, helping them detect movement and locate prey underwater.
* Claws: Their sharp claws are essential for grabbing and holding prey.
* Teeth: Their powerful teeth help them crush shells and tear flesh.
Important Note: While otters are skilled predators, they are also playful and curious creatures. Their diet is diverse, and they are an important part of their ecosystem.