Here's why:
* Habitat: Otters live in a variety of habitats, including rivers, lakes, coastlines, and even saltwater. They are adapted for swimming and foraging in water.
* Shelter: Otters find shelter in dense vegetation along riverbanks, under tree roots, or in rocky crevices.
* Protection: While some otters might use shallow dens for resting or raising young, their primary defense is their agility in the water and their ability to escape predators.
It's important to note that some species of otters, like the sea otter, have unique adaptations to survive in their environments. Sea otters, for instance, don't have dens, but they use kelp forests as a refuge from predators.
Overall, while burrows are important for many animals, they are not a significant factor in otter survival.