The truth is that otters aren't interested in you. They are, nevertheless, exceedingly territorial. Though their natural instinct is to dive and escape when approached, otters may be violent when defending their young or a food supply from a perceived threat. Their main form of defense is bluffing: raising their tails high in the air to look larger than they are. This can be effective since most predators avoid attacking something that appears dead. Otters eat almost anything edible, including fish, frogs, crabs, worms, and small animals. They also consume large amounts of plants, especially roots. Because of this voracious appetite, they are often referred to as "meat-eaters." Otters usually inhabit freshwater environments near lakes, rivers, and streams. However, some individuals may enter saltwater beaches and marshes to find different foods. These rare otters are known as "saltwater hunters" and tend to live near the coast with access to fresh water and seafood. Unlike other otters, these individuals don't make their own dens; instead, they use abandoned marine mammal holes or old woodpecker nests. They will stay together for protection against predators and so that the group's home range isn't violated by one individual. Otters in troops share food while traveling through areas used by more than one troop.