A study of the stomach content of some lampreys has shown the remains of intestines, fins and vertebrae from their prey. Although attacks on humans do occur, they will generally not attack humans unless starved.

Can a lamprey kill a human?

While they prefer fish, and won't come after we humans with nearly the same ferocity as they do aquatic creatures, there are accounts of lamprey attacks on humans. ... Despite this bizarre account, experts suggest these creatures would only attack a human out of mistaken identity.

Do lampreys attach to humans?

A lamprey has the physical ability to attach to a human but is extremely unlikely to do so. ... If a lamprey does attach to a human, it can be removed by raising it out of the water, which will cause it to suffocate.