whales
- sexpuppe neu
- Oct 9, 2023
- 3 min read
Whale, also known as cetacean, is the common name for some of the organisms in the marine mammal order Hypoceti. The suborder Hypoceti is subdivided into the baleen whale suborder (Mystacoceti) and the toothed whale suborder (Odontoceti).... are breathing with their lungs. In everyday language, whales and dolphins (as well as freshwater dolphins) are often separated, but in zoology they belong to the same lineage group. The dolphin family belongs to the suborder Odontoceti, which includes sperm whales and killer whales, and the suborder Baleen whales, which uses baleen instead of teeth and filters plankton from the water to feed, includes humpback whales and blue whales, which are the largest existing animals on Earth. Although whales are often referred to as "whales" and the character for whale is the Chinese character for fish, whales are not fish, but are a type of mammal.
Whales range in size from the Maui dolphin, which is only 1.2 meters long, to the blue whale, which is 34 meters long and weighs 190 tons, making it the largest living creature on Earth. Some species exhibit sex differences, with females being larger than males. Whales have streamlined bodies and flipper-like pairs of forelimbs. While not as agile as seals, whales can cruise at 20 knots. Baleen whales use folds in their throats to extend their mouths to swallow large mouthfuls of seawater. The right whale ingests forty percent of its body weight in seawater. Toothed whales, on the other hand, have cone-shaped teeth for catching squid and fish. Baleen whales have a well-developed sense of smell in the ocean, while toothed whales have a keen sense of hearing. The whales' sense of smell is so developed that they can be active both above and below the water, so much so that some whales can survive even when they are blind.
All subcetaceans are descended from the land animals of the order Artiodactyla, which in turn belongs to the biological classification of whales and hippopotamuses as Cetacea. Whales also returned to the sea from terrestrial mammals through a process of aquatic adaptation, which occurred during the Eocene epoch, about 52-83 million years ago.
Whales, dolphins, and porpoises, all of which belong to the order Artiodactyla, and whose closest blood relative to the two-toed hoofed animals is the hippopotamus, diverged about 40 million years ago, with paleontologists believing that the baleen whales first evolved into amphibious archaeocetes such as the walking whales, and then evolved into whales that lived exclusively in the water, such as the Lobotomy whales.
It diverged 34 million years ago into two suborders, toothed whales and baleen whales
Whales breathe with their lungs, swimming to the surface every four hours to breathe, and are warm-blooded with a body temperature of about 37°C and a heartbeat of only 10 beats per minute [1]. Their young are nurse-fed and have a little hair. Some species can dive to great depths, and they tend to have a thick layer of blubber, or blubber, that keeps them warm in cold water.
The whale's body is pike-shaped. Its forelimbs form flippers, its hind limbs are completely degenerated, and its tail becomes a caudal fin, which can swing up and down and is the main organ for swimming. Some species also have a dorsal fin, which is used to balance the body. There are 10 to 20 pairs of ribs, the stomach is divided into four chambers, and the kidneys are mostly verrucous.
Of particular note is the blue whale. It is the world's largest surviving animal, with a body length of up to 30 meters and a weight of 180 tons.
Whales generally live 40-90 years, varying by species.
The male whale's testes are located in the abdominal cavity and use the vas deferens to expel sperm into the female. After completing the fertilization process, the sperm and egg unite inside the female whale. The uterus of the female whale is bicornuate and has a pair of breasts located in the cleavage on either side of the genital cleft with elongated nipples.
Female whales usually give birth to a single calf. The parenting period is long, more than a year for some species. During this time, a very strong bond develops between mother and child. Some whales mature late, about seven to ten years. The whale's reproductive organs retract to avoid resistance while swimming. Mothers feed their young in seawater by ejecting milk into the mouths of their calves, who automatically separate the seawater from the milk.
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