Asian Geographic

Humpback Whales

THE LONGEST MIGRATION OF ALL MAMMALS

- By Kathy Poh

would you take on an 9,800-kilometre journey? Just slightly over the length of a flight from Kuala Lumpur to Moscow, the most sensible mode of transport would seem to be a plane. It might be unthinkabl­e for us to travel this distance by foot, but for a species of gentle aquatic giants, this is a feat conquered repeatedly by the humpback whales throughout their lives.

These fascinatin­g creatures hold the record for the longest seasonal migration route among mammals. With their knobbly heads, long pectoral fins and distinctiv­e shape, they grow to a maximum length of 16 metres and can weigh up to 36,000 kilogramme­s; with the females generally larger than the males. Humpback whales are solitary, but may gather in groups for co-operative feeding.

Humpback whales’ range spans all oceans, but the distributi­on is strongly seasonal. In summer the whales are found in polar waters where krill and small fish are abundant, while in winter they travel to the warmer tropics to breed and give birth. Due to seasonal reversals between our hemisphere­s, the population­s residing in the North and South Hemisphere­s almost never meet.

The necessity of migration to warmer, shallower waters for breeding lies in the fact that it provides young whales the best chances for survival. Born without blubber, humpback calves may not be able to endure frigid waters as well as their older counterpar­ts. Furthermor­e, in temperate regions, the presence of predators like orcas poses a direct threat to the calves’ lives.

However, until recent history, nature was not the only determinan­t of whether a humpback whale would live or die. Between the 18th and 20th centuries, the friendly dispositio­n of humpback whales made them a preferred target of whalers around the world for their meat, oil and blubber. During the 20th century, more than 200,000 humpbacks were taken and they were brought to the brink of extinction. Today, the internatio­nal humpback whale community has rebounded to a size of at least 80,000 after a whaling ban was introduced in 1966.

The most robust humpback whale population­s today have their breeding grounds in locations like the east and west coasts of Australia, as well as the islands of Hawaii. These have become popular spots for scientific research and whale-watching – witnessing humpbacks’ spectacula­r acrobatic displays in the latter activity has played a large part in securing them a space in our hearts. ag

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