What are some of the mammals that live in water?

Cetaceans, this type of animal adapted to swimming, their body surface hair degenerates, the subcutaneous fat thickens, the forelimbs evolve into fins, and the hind limbs degenerate and disappear. This order can be divided into baleen cetaceans and toothed cetaceans. Among them, baleen whales are the largest known living mammals. ‍‍

Manatees feed on seagrass or other aquatic plants, and their hind limbs are vestigial, and their forelimbs are specialized into flippers and are pulpy. Manatees have hair on the surface of their bodies during their embryonic period, and when they mature, the hairs disappear and remain only around the lips. They have a large amount of fat under their skin, which is used to keep them warm in water. ‍‍

The limbs of pinnipeds are all specialized into fins, among which, the flipper feet of their forelimbs become larger, the hair on the surface of the ** surface degenerates and disappears, and the hind limbs are backwards, such a structure is more conducive to crawling on land. The representative animal in this order is the spotted seal, which is the following item. ‍‍

Sea lions, seals, walruses, manatees, dolphins, dugongs, whales, otters, sea otters.

Sea sloths. This member of the weasel family is also the smallest marine mammal, with females weighing around 60 pounds and males weighing up to 90 pounds. Although they are small, they are also very intelligent.

They are the only marine mammals known to use tools. They open clams with stones and store the food they collect in folds in their armpits! Another feature that sets them apart is their lack of fat and their predominance for fur to keep them warm.

This feature makes them particularly susceptible to oil spills, which can affect the thermal insulation of their fur. ‍‍

For example, the typical whale is known to everyone, and even many people have been calling it whales. This is because whales look too much like fish. However, in fact, the whale itself is a mammal, and its ancestor is artiodactyl, if you are not familiar with artiodactyls, the most common is artiodactyls

Cetaceans are the largest phylum of aquatic mammals, and can be said to be the most familiar aquatic mammals, one of our cetaceans endemic to China, the white-sided dolphin, also known as the Chinese finless porpoise. They live in the middle and lower reaches of the Yangtze River and are known as the "giant pandas in the water" and were once one of the 12 most endangered animals in the world, but unfortunately they were declared "functionally extinct" on August 8, 2007

Bottlenose dolphins, bottlenose dolphin cubs stay with their mothers for up to six years, learn how to hunt and become excellent dolphins. Adult dolphins can reach 8 to 12 feet in length and weigh up to 1,430 pounds. Bottlenose dolphins are protected in U.S. waters. ‍‍

While polar bears live primarily on land or ice, they are excellent swimmers and are known to swim up to 45 miles per day. Large animals that weigh up to 1,500 pounds, most of which hunt seals. In recent years, biologists have observed that bears are now swimming more than ever as the melt extends the distance between the Arctic ice streams.

Since they rely on sea ice to hunt seals, polar bears are considered threatened because of global warming, where the ice melts and thins in the Arctic. ‍‍

Freshwater-dwelling mammals: white-sided dolphins.

Hippos, otters.

Beaver. Mammals that live in saltwater: beluga whales, beluga bears, seals, fur seals, manatees, sea lions, dolphins, walruses, killer whales.

Blue whales, sperm whales, dugongs, small warm whales, horned whales, Chinese white dolphins, humpback whales, marine mammals mainly include cetaceans, manatees, pinnipeds (or pinnipeds). In addition, sea otters spend almost their entire lives at sea and rarely land and are considered marine mammals.

Further information: Marine mammals are vertebrates in the ocean that are viviparous, breathing, lung-breathing, constant-thermal, streamlined, and have fin-shaped forelimbs, also known as sea mammals. Marine mammals have the characteristics of both terrestrial higher mammals and aquatic animals, and are a special group of mammals suitable for marine environment, including cetaceans, manatees and pinnipeds, which are mostly distributed in the world's oceans from the north and south poles to the equator.

The animals living in the water are divided into four categories: fish, coelenterates, crustaceans, and molluscs: seahorses, sea dragons, yellow eels, carp, crucian carp, sturgeon (the swim bladder is the maw gum), large yellow croaker (otoliths are fish brain stones), and sharks.

Coelenterates: hydroids, bowl jellyfish, corals, ctenophores, ctenophores.

Crustaceans: shrimp, crabs.

Molluscs: squid, octopus.

Most of them are first-order aquatic animals that have not lived out of water during the evolution of the species, but there are also second-order aquatic organisms such as whales and aquatic insects that have been transformed from terrestrial animals, some of which do not rely on dissolved oxygen in water for respiration. According to the habitat, it can be divided into two types: marine animals and freshwater animals. In vertebrates, the osmotic pressure of body fluids is generally between that of seawater and freshwater, so there is a reverse situation between marine and freshwater animals in terms of the osmotic regulation mechanism of body fluids.

The most common aquatic animals are fish (fish), in addition to coelenterates such as sea anemones, jellyfish, and polyps; molluscs such as squid, octopus; crustaceans, such as shrimp, crabs; Other animals such as dolphins (mammals), turtles (reptiles), and other creatures.

The most common aquatic animals are fish (fish), in addition to coelenterates such as sea anemones, jellyfish, and polyps; molluscs such as squid, octopus; crustaceans, such as shrimp, crabs; Other animals such as dolphins, whales (mammals), turtles (reptiles), and other creatures. Whales breathe with their lungs, so they belong to mammals, not fish.

Fish, rays, sharks, sea cucumbers, boneworms, shellfish, anemones, jellyfish, polyps, squid, octopus, shrimp, crabs, dolphins, turtles, walruses, sea lions.

Animals that breathe with their gills and animals that walk aquaponically.

White-sided dolphin: It is an aquatic mammal endemic to China. Beaver:

The body is fat, the head is short and blunt, the incisors are sharp and the masseter muscles are well developed. Beluga whale: Prefers to live on or near the surface of the sea.

Dolphins: Belong to the most rapid mammals in the water. Killer whales:

Activities are often carried out in the family unit.

1. White-sided dolphins

The white-sided dolphin is an aquatic mammal endemic to China, belonging to small freshwater whales with a spindle-shaped body, a body length between 1.5 and 2.5 meters, a blue-gray body color, and a white ventral surface.

2. Beavers

Beavers are also aquatic mammals, with a fat body, a short, blunt head, sharp incisors and well-developed masseter muscles, and often live near rivers in cold temperate coniferous forests and mixed coniferous and broad-leaved forests.

3. Beluga whale

Beluga whales have a light body color and a distinctive white color, they like to live on or near the surface of the sea, and they have a strong diving ability, and the water temperature in the beluga whale habitat is 8 to 10 degrees.

4. Dolphins

The dolphin is a small or medium-sized toothed whale that lives widely in the world's oceans and is one of the fastest mammals in the water.

5. Killer whales

Killer whales are large toothed whales, one of the highly social animals, and one of the marine mammals, often moving in families, and killer whales are large in size and have a conical head.

Aquatic mammals include dolphins, killer whales, seals, blue whales, humpback whales, baleen whales, sea lions, walruses, fur seals, sea otters, platypus, manatees, sperm whales, dugongs, small warm whales, horned whales, Chinese white dolphins, beluga whales, white-sided dolphins, hippos, otters, beavers, etc. Living aquatic mammals mainly include cetaceans and pinnipeds. The cetaceans include the suborder of toothed whales and baleen whales, and 98 species of viviparous mammals that live in oceans, rivers and lakes, including the dolphin family.

Dolphin profile. Dolphin is a group of aquatic mammals of the dolphin family (scientific name: delphinidae), which is a small or medium-sized toothed whale that lives widely in the world's oceans, and is also distributed in brackish and fresh water near inland seas and river estuaries, and some species are found in inland rivers.

Usually prefers to live in groups and prey on fish, squid, etc.

Introduction to killer whales. Orca whale (scientific name: orcinus orca):

It is the largest species in the mammalian and dolphin families. The head is conical and does not have a protruding beak. There is a distinct sexual dimorphism in the body size, flipper size, and dorsal fin height.

The large, towering dorsal fin is located on the back**, with the male adult erect dorsal fin up to a metre high, and the female's dorsal fin distinctly sickle-shaped, less than 1 metre high.

Seal profile. Seals are a collective term for the pinniped subspecies seals. Seals are broad, round, spindle-shaped.

The whole body is covered with short hair, the back is blue-gray, and the belly is creamy yellow with blue-black spots. The head is nearly rounded, the eyes are large and rounded, there is no external auricle, the snout is short and broad, and the upper lip tentacles are long, thick and hard, in the shape of a rosary.

The most common aquatic animal is fish, but there are also coelenterates such as sea anemones, jellyfish and polyps, molluscs such as squid, snails and octopuses, crustaceans such as shrimp and crabs, and other animals such as dolphins and whales (mammals). Whales breathe with their lungs, so whales belong to mammals, not fish.

Aquatic animals can be divided into marine animals and freshwater animals according to their habitats. In vertebrates, the osmotic pressure of body fluids is generally between seawater and freshwater, so there is a reverse situation between marine and freshwater animals in terms of the osmotic regulation mechanism of body fluids. Aquatic animals refer to animals that live mainly in water.

Most aquatic animals are aquatic animals that have not lived in the evolution of the species, and there are also aquatic animals such as whales and aquatic insects that have been transformed from terrestrial animals to aquatic animals, and some of the latter do not rely on dissolved oxygen in water for respiration.