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What do they look like?
It's obvious when you come across a sea lamprey. These creatures are huge in stature and body shapes and have unique mouths. Their bodies are usually a little longer than two feet. The lamprey's mouth is wider than the rest of its body and has round rows of teeth inside and a long thin tongue. The mouth is also somewhat of a suction cup, allowing it to attach itself to just about anything it wants.

How do they behave?
Watching a sea lamprey prey on its potential food is quite a sight. They use their suction-cup-like mouths to attach themselves to their meals of fresh cod or salmon. Then the sea lamprey punctures the fish with its teeth and sucks out all its blood and fluids. This, of course, causes the other fish to die, and allows the lamprey to eat the fish.

What else do you need to know about them?
Sea lampreys spawn in about 50-degree water in the late winters. They generally prefer cooler temperatures to the more moderate ones, regardless of whether its spawning season. In late winter, the lamprey's sexual reproductive system grows and their stomachs shrinks. They don't even eat in the winter but simply live off their stored fat. When they spawn, both the males and females build a nest on the bottom of their habitat made out of gravel and stones. They use their suction mouths to build the nest. The females lay about 100,000 eggs per season. But they will only have one spawning season. Male and female lampreys die after they reproduce.