" " A humpback whale breaches in the Pacific Ocean at the Uramba Bahia Malaga National Natural Park in Colombia. Humpbacks migrate annually from the Antarctic peninsula into the Pacific Ocean off the coast of Colombia, an approximate distance of 5,280 miles (8,500 kilometers), to give birth and nurse their young. MIGUEL MEDINA AFP/Getty Images Known for their mystical songs, global travel and impressive gymnastics, humpback whales ( Megaptera novaeangliae) are one of the ocean's most captivating and complex giants. While they aren't as big as the blue whale, the largest animal on the planet, humpback whales are still quite the whoppers, growing up to 60 feet (18.3 meters) long and weighing up to 40 tons (36 metric tons). That's about the length of one city bus but the weight of two.