How well do sea otters hear?

Sea otters have a relatively good sense of hearing, which is important for their communication and predator awareness. They can detect sounds in both air and water, allowing them to respond to threats and interact with each other effectively. However, their hearing is not as acute as that of some other marine mammals, such as dolphins or whales, which rely more heavily on echolocation. Overall, while sea otters are not the best hearers in the animal kingdom, their auditory abilities are well-suited to their ecological needs.