Sea lampreys are eel-shaped fish that use their mouth to attach and feed on the blood and fluids of other fish. They are most primitive of all 46,000 known species of vertebrates, meaning that these...
Sea lampreys are eel-shaped fish that use their mouth to attach and feed on the blood and fluids of other fish. They are most primitive of all 46,000 known species of vertebrates, meaning that these...