This thing is one of the most successful hunters on the planet. Because their mouth is fused shut, except for the tip, they can create a powerful suction force in front of that one little opening in order to draw in prey.
Lions have a 20-30% success rate on their hunts, depending on daytime and if they’re in a group. Great white sharks, anywhere from 40% to 80%, depending on the size and skill of the individual. Dragonflies, which are one of the most successful terrestrial hunters, can hit about 80-85%. Seahorses? 90% success rate, sometimes more. Only a fraction of their prey escapes that powerful vacuum. They’re incredibly precise.
If you touch them, they feel hard, because of the skeleton underneath their skin. Their tails are being studied to make coiling bridges, because of how strong that interlocked structure is. Different species range in size from over a foot long, to barely an inch.
Behold: not just a fish, but a wildly successful predator!