The mass die-offs, which can occur naturally, are becoming more common around the world—and scientists say humans are to blame. Here’s why, and how we can help prevent them. Dead fish float among ...

Octopuses in the Red Sea often hunt together with other predatory fish—and sometimes hit them. New videos suggest they're keeping fish in line. Day octopuses in the Red Sea team up with up fish 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 ...