Portal:Cetaceans/Did you know/List
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- ...that the Southern Right Whale got its name because it was the ‘right’ whale to kill? Because they swim slowly, close to the shore and float when killed, the whalers thought them the right whales to kill!
- ...whale and dolphin mothers ‘suckle’ their young underwater! Mothers have muscular mammary glands and ‘squirt’ their milk into the calf’s mouth, to ensure that the calf takes in as much of the energy rich milk as possible.
- ...newborn cetacean calves ‘suckle’ three to four times each hour and will suckle from their mothers for six months or more.
- ...dolphins often leap clear of the water when travelling at speed. This is because the density of water is much greater than that of air and they are able to travel faster by leaping out of the water.
- ...on average, a whale or dolphin will eat four to five percent of its body weight in food per day. That means that a 100 ton blue whale will eat almost five tons of krill per day, or that a 200kg bottlenose dolphin will eat 10kg of fish per day!
- ...because whales and dolphins are streamlined to swim in water, they do not have external organs. This makes it almost impossible to tell the sex of a whale or dolphin when watching them on the sea surface.
- ...whales and dolphins don’t sleep in the way humans do. Although we don’t know how they sleep, some scientists believe they sleep with half the brain asleep and half the brain awake, keeping them aware of danger.
- ...there are probably types of cetaceans that are as yet unknown. For example, the Longman's beaked whale is only known from skulls washed ashore in Somalia and Australia. It has never been seen alive!
- ...all whales and dolphins have the remains of the pelvis, but it is reduced to two small bones at the rear of the animal.
- ...the ‘strapped toothed’ whale is so called because in mature males there are only two teeth in the bottom jaw and these completely ‘strap’ the upper jaw, preventing it from opening more than a few centimetres. How these animals eat is unknown, but it may be that they stun their prey with high intensity sound.
- ...some cetaceans can dive to depths of more than a kilometre and stay there for more than an hour.
- ...common dolphins, which are often seen off South Africa’s east coast, can occur in schools of several thousand. The biggest school on record was estimated to consist of about 15,000 dolphins!
- ...when southern right whale and humpback whales breach (leap out of the water), seagulls can often be seen darting in to pick up pieces of skin that become dislodged from the breaching whales. Presumably this is an easy source of food for seagulls.
- ...newborn cetacean calves do not have the skills to swim for long periods or to accelerate away from danger, so they swim in the slipstream of their mothers, enabling the mother to protect her calf.
- ...the Orca, is the fastest swimmer of all the cetaceans and can reach speeds of more than 50km/h while hunting.
- ...all cetaceans have a blubber layer — a layer of fat under the skin. In most dolphins, this layer is about one quarter to one third of the total body weight, but in southern right whales nearly half of its weight (up to 50 tons) will be blubber.
- ...the Blue Whale has the largest penis of any animal on earth, estimated at over 2 m (more than 6½ feet)
- ...baleen from the Mysticeti whales mouths was used to stiffen parts of women's stays and dresses, like corsets
- ...the Beluga Whale's milkfat is so high, the calf gains up to 2 kilograms per day on the diet. It is so fatty that the color is green.
