Megalodon ) is an extinct species of shark that lived approximately 28 to 1.5 million years ago, during the Cenozoic Era (late Oligocene to early Pleistocene). The. The giant prehistoric shark Megalodon is one of the few animals to be identified by its species, rather than its genus, name: technically, this predator is known as. Sharks are a group of fish characterized by a cartilaginous skeleton, five to seven gill slits on the sides of the head, and pectoral fins that are not fused to the head. Feb 06, 2013 · Giant Squid - Life of Sea. Life of Sea | Giant Squid | The giant squid is the second largest mollusc and is the second largest of all. These are some of our favorite Shark Photos from Shark Week. Shark Week starts Sunday, August 4, with new premieres at 9|8C only on Discovery. How Do Great White Sharks Reproduce?. The great white shark is probably the most commonly known of all the sharks . With its gruesome appearance, wide gaping mouth. Sharks at EnchantedLearning.com: rhymes, crafts, and a printout.. EnchantedLearning.com is a user-supported site. As a bonus, site members have.