Squab uses its gills to breathe under water. Squab's gills are located on each side of his body, right above his stomach. These gills flutter while breathing, and while flutter are a faster pace when Squab is in danger. Squab doesn't need to go up for air so he is able to breathe fully in his coral reef habitat, away from predators.
Squab generally feeds on small animals like starfish, small sea snakes, sponges, and other small species of fish. Squab uses it's famous technique of hiding between the colorful coral that match his tentacles, waiting for it's prey to swim by. as the innocent fish swims by the "coral", Squab wraps its tentacles around it's body before the fish even knew what is going on. Squab's tentacles are extremely strong, and they suffocate the fish in a matter of 50 seconds. after the fish has died, Squab gulps it into his mouth at the front of his body. Squab's use of his tentacles as a capturing mechanism benefits his survival greatly because as you can see, Squab doesn't have very sharp teeth. this leaves him with no ability to attack prey, so Squab's tentacles play a major role in his survival.