Angelshark

The 13 species of angelsharks, in the family Squatinidae, have a compressed body and extended pectoral and pelvic fins. The skin on the surface of an angelshark's body is protected by spiky dermal denticles, while the underside has flattened scale-like denticles that enable the shark to glide over obstacles on the sea floor. It is able to rest flat against the bottom and pump water across its gills without having to swim, and has an enlarged spiracle behind each eye through which seawater can enter the pharynx rather than through the mouth. This avoids blocking up the system with debris and bottom sediments.

It uses these adaptations to catch a meal, and is a skilled exponent of the surprise attack. It lies on the bottom, hidden in sand or mud, and waits. It appears to rely less on the senses of smell, hearing and the ability to detect electricity, and more on vision. Lying dormant until something edible passes by, it suddenly rears up like some gigantic monster, opens its enormous mouth, and sucks in its victim.