The Biggest Blue Whale and Porpoise Dolphin ~ Kwentology

Image of Blue WhaleBlue whales once lived in all oceans. Now most are found in Antarctic waters. Image by Bschwehn.

The blue whale is the largest whale, and also the largest mammal that has ever lived. It measures more than 100 feet (30 m) long and weighs at least 90 tons. The biggest blue whales may weigh more than twice this amount. Although it is so huge, the blue whale is not a fierce hunter. It eats tiny shrimplike creatures called krill. It may gobble up as many as four million of these in a day.

Blue whales normally swim at about 5 mph (8 km/h), but can move at speeds of up to 18 mph (30 km/h) when disturbed.

A Tasteful Meal for Blue Whale

A blue whale filters small shrimplike creatures called krill from the water. Hanging fro the whale's upper jaw are lots of plates of a fringed bristly material called baleen. The whale opens its mouth and water full of krill flows in. The whale forces the water through the baleen with its tongue. The water flows out at the sides of the mouth, leaving the krill behind on the baleen for the whale to swallow.

Travellers of the Depths

The migration, whales such as humpbacks migrate—travel seasonally—to find the best conditions for feeding and breeding. They spend much of the year feeding in the waters of the Arctic and Antarctic, where krill are plentiful. When it is time to give birth, the humpbacks travel to warmer waters near the equator.

Dive Into the Farthest Point

The sperm whale routinely dives to at least 0.6 miles (1 km) beneath the surface of the sea and may go down to even greater depths when chasing giant squid to eat.

Humpback Whales Do Really Sings

They make a series of sounds, including high whistles and low rumbles, that may continue for more than 20 minutes. No one knows why the humpback whale sings, but it may be to court a mate or to keep in touch with others in the group.

Ever Surface and Neither Come to Land

Whales spend their whole lives in the sea. But they do breath air and have to come to the surface regularly to take breaths.

What is a Porpoise?

A porpoise is a small whale with a rounded head, not a beaked snout like a dolphin. There are about six species of porpoise. They live in coastal waters in the Atlantic, Pacific and Indian Oceans, and feed on fish and squid.

Whales Giving Birth in the Water

Yes, they do. The baby whale comes out of the mother's body tail first so that it does not drown during birth. As soon as the head emerges, the mother and the other females attending the birth help the baby whale swim to the surface to take its first breath.

What is a Narwhal?

A narwhal is a whale with a single long tusk at the front of its head. The tusk is actually a tooth, which grows out from the upper jaw. It can be as much as 10 feet (3 m) long. Only the males have tusks. They may use them in battles with other males.

Image of DolphinsSome dolphins leap clear out of the water. Spinner dolphins perform amazing acrobatics when they do this. Image by Benng.

Dolphin a Kind of Whale

A dolphin is a small whale. Most of the 32 or so species of dolphin live in the sea, but there are five species that live in rivers. The biggest dolphin is the killer whale, or orca, which grows up to 32 feet (9.8 m) long. Small whales such as dolphins may swim at more than 30 mph (50 km/h). Dolphins have streamlined shape and a beaked snout containing lots of sharp teeth. They are fast swimmers and catch sea creatures such as fish and squid to eat. A form of ultrasound helps dolphins find their prey. A dolphin gives off series of high-frequency clicking sounds that bounce off anything in their path. The echoes tell the dolphin about size and direction of the prey.

Kwentologist Tells You More About Baby Blue Whale

A baby blue whale is about 26 feet (8 m) long at birth and is the biggest baby in the animal kingdom. It weighs about 3 tons.
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