Humpback Whale
The iconic "leaping" whale of the southern oceans
What you need to know about the Humpback Whale
Our Expert Says… "Young Humpbacks can be very curious once they are weaned and in their adolescence, and close encounters with young whales from the Zodiacs are a delightful experience. It's really encouraging to see their numbers increasing, and it has been very pleasing to see the Australian population come off the endangered list recently."
The humpback whale is one of the most well-recognized of the baleen whales, thanks to its long pectoral fins and obviously humped back, as well as its “signature” habit of breaching - throwing most of its body out of the water, to crash down on their backs.
There are populations of humpback whales in all of the world’s oceans, although it’s thought that they don’t frequently mix. Humpbacks feed in the polar regions during the summer, laying down fat reserves that they need to sustain them as they move towards the equator to breed and give birth in the winter. Because of this migratory behavior, humpback whales can travel up to 16,000 miles every year.
Humpbacks grow to around 15m (50ft) in length and weigh about 33 tons. Their pectoral fins grow to about one third the length of their body, with the longest ever measured being over 6m (20ft)!
In common with other baleen whales, humpbacks feed primarily on krill, small crustaceans, and schools of small fish. They show a wide range of hunting techniques including stunning prey with surface slaps of their pectoral fins, and the remarkable “bubble netting” behavior. Here they hunt in groups, and individual whales blow a steady stream of bubbles while swimming together in decreasing circles around a school of prey. The bubbles trap the prey, and as the whales come closer and closer, the school is compacted into a tighter and tighter ball. The whales then rush upward into the center of the school with mouths open, filtering the food out of the water using their baleen plates.
Juvenile humpback whales are known to be attacked by orcas, and adult humpbacks have been observed using their pectoral fins to defend calves against attack, “clubbing” the orcas to deter them. Great white sharks have also recently been witnessed hunting in a group to attack and kill an adult humpback whale. How common these attacks are is unknown.
Sadly, these magnificent creatures were commercially hunted during the 20th century to the point where they were on the verge of extinction. At the time of the 1966 moratorium on whaling, there were thought to be fewer than 5,000 humpback whales in existence. Although numbers have recovered since then to around 80,000 they are still down from their pre-whaling population of about 125,000. Humpbacks are still potentially vulnerable to the effects of climate change and from collisions with ships and entanglement in fishing gear, as well as disturbance from underwater noise pollution.