Sharks are a group of elasmobranch cartilaginous fishes characterized by a ribless endoskeleton, dermal denticles, five to seven gill slits on each side, and pectoral fins that are not fused to the head. Modern sharks are classified within the division Selachii[1] and are the sister group to the Batomorphi (rays and skates). Shark® Vacuums with innovative technology deep-cleans dirt, debris & pet hair on carpets and hard floors! Shop Shark® the #1 vacuum brand in the US*.

General Overview

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Key Points

by Leonard J.V. Compagno, Ph.D., the world’s foremost expert on sharks and Director of our Board of Trustees. Shark, any of numerous species of cartilaginous fishes that make up the order Selachii (class Chondrichthyes). Most species have a tough skin that is dull gray in color and roughened by toothlike scales. Common kinds of shark include the hammerhead shark, the great white shark, the tiger shark, and the mako shark. Most sharks are cold-blooded, but some, like the great white shark and the mako shark, are partially warm-blooded. Readers interested in this topic may also find value in our analysis of Vibrant Free Printable Coloring Pages For 8 Year Old Girls Right Now which further elaborates on the core themes addressed in this section.

Topic Outline

Common kinds of shark include the hammerhead shark, the great white shark, the tiger shark, and the mako shark. Most sharks are cold-blooded, but some, like the great white shark and the mako shark, are partially warm-blooded.