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What do they look like?
There are so many different types of groupers available in tropical waters and in fish stores, it is difficult to describe what one looks like. The main trouble comes when describing the grouper's colorings. They could be any of a number of colors. Some groupers are bright oranges; some are orange with black stripes, some aren't orange at all. They could be black, yellow, red, bright blue. And they could very well be spackled with dots or have stripes running horizontally or vertically across their bodies. Nonetheless, groupers are often the most colorful and interesting animals in an aquarium. They have a mean appearance about them. They are thick animals and have a large circumference. Their eyes are large and round and protrude from their heads and their jaws make them look as if they're ready to eat anything that gets in their way. Their lower jaw is typically larger than their upper jaw and they swim around with their two front, oversized fangs sticking up off their lower jaw.

How do they behave?
Groupers like to eat other fish. Even though their mouths are large, these features have the ability to grow to incredible size. If they want to eat a large fish, they can expand their mouths and chomp it to death. These fish also have the ability to change their color to match their surroundings, if they so choose. But generally the color changes take place either when they feel threatened or if they want to hide from a prospective prey.

What else should you know about groupers?
When groupers spawn, they like to do so during the late evening hours. And one of the other reasons these fish are so unusual is that they switch genders throughout their lives. They are born as females but then switch their gender to males when they're older. Only females, obviously, can lay eggs.