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What do they look like?
Pursefish are interesting tropical fish in that they can–in an instant–change their body shapes and the appearance and fend off would-be predators. Normally, pursefish are rather colorful but dull-looking creatures. Their colors range from browns to yellows to blacks to oranges. Their undersides are almost always white. They also have beaks that are in three different rows of teeth. Two are in the upper jaw (one on each side) and the other is on the lower jaw in the middle. But when they feel threatened by a larger attacker, they rotate their pelvis downward and a huge piece of skin drops down. This piece of skin can be inflated with water and has an eye-shaped dot on it in order to scare potential predators.

How do they behave?
Pursefish aren't known for an attacking nature, rather they spend a lot of time defending themselves. When they drop their huge expansive piece of skin from their pelvis, an attacker may question whether it wants to eat the pursefish or at least hesitate enough to give the fish a chance to escape from harm.

What else should you know about them?
Pursefish generally live in deep tropical waters. They like warm temperatures in which to live, and you'll mostly find them in the Indo-west Pacific waters. You'll usually find them near coral reefs.