Tails of Whales tails

Apparently the humpback whale’s tail is distinctive so you can actually tell them apart. The markings are on the underside of the tale.
Humpback whale facts: Adult males measure 40-48 feet (12.2-14.6 m) Adult females measure 45-50 feet (13.7-15.2 m). They weigh 25 to 40 tons (22,680-36,287 kg). Its flippers are very long, between 1/4 and 1/3 the length of its body, and have large knobs on the leading edge. The flukes (tail), which can be 18 feet (5.5 m) wide, is serrated and pointed at the tips. The head of a humpback whale is broad and rounded when viewed from above, but slim in profile. The body is not as streamlined as other rorquals, but is quite round, narrowing to a slender peduncle (tail stock). The top of the head and lower jaw have rounded, bump-like knobs, each containing at least one stiff hair. The purpose of these hairs is not known, though they may allow the whale to detect movement in nearby water. There are between 20-50 ventral grooves which extend slightly beyond the navel. The body is black on the dorsal (upper) side, and mottled black and white on the ventral (under) side. This color pattern extends to the flukes. When the humpback whale “sounds” (goes into a long or deep dive) it usually throws its flukes upward, exposing the black and white patterned underside. This pattern is distinctive to each whale. The flippers range from all white to all black dorsally, but are usually white ventrally. About 2/3 of the way back on the body is an irregularly shaped dorsal (top) fin. Lifespan: Humpback whales have a life expectancy of 45-50 years