Unbelievable Sea Creatures: Lampreys have Round, Sucker-like Mouths Filled with Rows of Teeth

Everyone, out of the water! Lampreys have round, sucker-like mouths filled with rows of teeth. As adults, they parasitise other fish, latching onto them with their sucker mouths and scraping the skin away with their teeth. They release anticoagulants to help the blood to flow more easily from their hosts, many of which die from excessive blood loss or infection.

Image: Dave Herasimtschuk / USFWS Pacific