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Sea otter (Enhydra lutris), also called great sea otter, rare, completely marine otter of the northern Pacific, usually found in kelp beds. Floats on back. Looks like sea otter laughing. saltwater otters
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saw shark

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Also known as: Pristiophoriformes, sawshark
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Also spelled:
sawshark

saw shark, (order Pristiophoriformes), any of about nine species of long-snouted marine sharks belonging to the order Pristiophoriformes. Saw sharks are found in tropical and temperate marine waters of the western Atlantic Ocean near Florida and the Bahamas, the Indian Ocean near India and southeastern Africa, and the Pacific Ocean near eastern Asia and Australia. Saw sharks are characterized by a long, slender, sawlike snout equipped with sharp, toothlike projections on each edge. They resemble the rays known as sawfishes but have a pair of barbels (slender, fleshy protuberances) on the underside of the saw and have gill slits on the sides of the head, not underneath.

Image thumbnail shows a illustration of a shark resting its head on a pillow.
Do sharks sleep?It's a common misconception that no sharks ever sleep.
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Saw sharks grow to a maximum of about 1.37 metres (about 4.5 feet) long. They feed on fish, striking and cutting their prey with their saws, but are harmless to humans. There are two genera of saw sharks: Pliotrema, with six pairs of gill openings, and Pristiophorus, with five.

The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Meg Matthias.