Hourglass dolphin

The hourglass dolphin (Cephalorhynchus cruciger) is a small, fast swimming dolphin of Antarctic and sub-Antarctic waters with a circumpolar distribution, generally found between about 45 and 67 degrees south, though it has been seen as far north as 33 to 36 degrees south in the South Atlantic and off Chile. It is colored black above and white on the belly, with two white patches on each flank, one near the beak and flipper and one toward the tail, joined by a thin white line to form the hourglass pattern that gives the species its name; its scientific name cruciger means cross carrier, describing the cross like pattern seen from above. Adult males measure about 1.8 meters and weigh over 90 kilograms, while juvenile females range from 1.6 to 1.8 meters and 70 to 90 kilograms, and the species prefers cold water between about minus 0.3 and 7 degrees Celsius, moving farther south in the austral summer and north in winter.