Pufferfish much like a chameleon, pufferfish can move their eyes independently of one another, allowing them to look in two different directions at once. It also carries enough toxin to kill 30 adult humans, and there is no known antidote.
Sharks have inhabited the world's oceans for over 450 million years—making them older than trees and the first dinosaurs.
Tuna are among the fastest fish in the ocean, with species like the yellowfin tuna reaching speeds of up to 47 mph.
When flying fish leap they can reach heights of 20 feet above the water.
Seahorses are famous for being the only vertebrate species where the male becomes pregnant and gives birth.
Dragonets are primarily bottom-dwellers that use their large pelvic fins to "walk" along the seafloor or coral rubble rather than swimming continuously.
Clownfish can change their biological sex from male to female to maintain social hierarchy
Despite centuries of study, as of 2026, no human has ever actually witnessed eels mating or spawning in the wild.
Grouper use their mouths and gills to create a vacuum that suck prey from a distance, swallowing it whole in a fraction of a second.
Stonefish are widely considered the most venomous fish in the world.