鮫

サメは、魚類のひとつ。夜行性。骨はすべて軟骨である。海の魚の中でも原始時代の魚にあたる。-wikipedia.jp

Sharks are a group of fish with a full cartilaginous skeleton, a streamlined body plan with between 5 and 7 gill slits along the sides (most often) or side of the head (the first modified slit is behind the eye and called a spiracle), dermal denticles covering the body to protect from parasites, and rows of replaceable teeth in the mouth.-wikipedia.en

:動物