Like other reef sharks, the gray reef shark has a broad, round snout and large eyes, and is a very fast and agile predator. An aggressive shark, it tends to dominate other reef sharks in its territory. When threatened, the gray reef shark hunches its back, lowers its fins and swims in a side to side motion. This species is common to coral reefs in the Indo-Pacific.
A pack of blacktip reef sharks scatters a school of fish. Unlike the gray reef shark, the blacktip reef shark is timid and difficult to approach. It's common in nearshore waters of the tropical and subtropical Indo-Pacific.
A silky shark, so named because of the smooth texture of its skin. In comparison to most sharks, the silky shark's denticles (shark scales) are very small and densely packed, giving its skin a "silky" feel. It lives in tropical waters worldwide, where it excels at driving fish into compact schools before launching open-mouthed, slashing attacks.
Gray reef sharks feed mainly on bony fishes, like the parrotfish. Cephalopods (octopus and squid) and crustaceans making up the rest of their diet. They're experts at capturing fish swimming in the open, but can sometimes be seen pinning their victims against the sides of a coral reef for an easy kill. Gray reef sharks have a very acute sense of smell and are known to go into feeding frenzies.
A silvertip shark patrols the Great Barrier Reef in Australia. Looking like a larger, bulkier version of a gray reef shark, the silvertip shark can be easily identified by the prominent white margins on its fins. An aggressive shark, it eats eagle rays and smaller sharks when it's not feeding on bony fish and cephalopods. Like gray reef sharks, silvertip sharks will perform a threat display to warn of an impending attack.