A tool tucked into a fish's headSourced
Male chimaeras have a head clasp.
They can tuck it away.
Male chimaeras, a group of cartilaginous fish, have a tooth-bearing structure on top of the head. It helps grasp a mate and can be flexed and retracted into a pocket on the head.
A fish's head can hide
a surprising piece of anatomy.
Summary / translation: Unbubly · CC BY-SA 4.0
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Holocephali · Wikimedia contributors
Adapted, summarized and translated from the source. Adapted text is also available under CC BY-SA 4.0.
Reviewed: 2026-10-01