A protective mucous cocoon surrounds this parrotfish as it sleeps in Australia's Great Barrier Reef. This layer of protection helps fend off predators so parrotfish can get a good night's rest.

Sperm whales are the largest toothed whales and are known for their extreme diving abilities. They often go down to 3,000 feet in search of squid, their primary food source. These dives can last up to ...

Whales, the colossal beings of the ocean, are not just a marvel because of their size, but also due to their intriguing behaviors and physiological mysteries. From their unique sleeping patterns to ...

Sleep in fish may look different from humans, but rest is essential for survival. Here’s what experts have to say about fish sleep. A protective mucous cocoon surrounds this parrotfish as it sleeps in ...