Sergio Hanquet / Angel shark (Squatina squatina) resting on sea floor. Tenerife, Canary Islands.

Sergio Hanquet / Angel shark (Squatina squatina) resting on sea floor. Tenerife, Canary Islands.

Pascal Kobeh / Angel shark (Squatina squatina) buried in the sand, Canary Islands

Pascal Kobeh / Angel shark (Squatina squatina) burried in the sand, Canary Islands

Pascal Kobeh / Angel shark (Squatina squatina) swimming above the sandy bottom with divers in the background, Canary Islands

Pascal Kobeh / Angel shark (Squatina squatina) swimming above the reef, Canary Islands

Pascal Kobeh / Angel shark (Squatina squatina) laying on the sand, Canary Islands

Pascal Kobeh / Two angel sharks (Squatina squatina). One is laying on the sand while the other is completely burried in the sand. We can hardly make out its shape, Canary Islands

David Fleetham / Pacific angel shark (Squatina californica) resting on sea floor. Santa Barbara Island, California, USA.

David Fleetham / Pacific angel shark (Squatina californica) swimming above sea floor. Santa Barbara Island, California, USA.

Tony Wu / Japanese angelshark (Squatina japonica) engaged in ambush predation, leaping out of the sand to catch a small silver-stripe round herring (Spratelloides gracilis). Japan, Pacific.

Tony Wu / Japanese angelshark (Squatina japonica) engaged in ambush predation, leaping out of the sand to catch a small silver-stripe round herring (Spratelloides gracilis). The cloud of sand thrown up by the s...