bottlenose dolphin

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A marine mammal (Tursiops truncatus) of temperate and tropical waters worldwide, having a short protruding beak, a gray or brown stocky body, and a prominent curved dorsal fin.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun One of two species of gray dolphin between 2 and 4 meters in length inhabiting warm and temperate seas worldwide.
• noun A member of the genus Tursiops, thought to consist of three species.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun any of several dolphins with rounded forehead and well-developed beak; chiefly of northern Atlantic and Mediterranean