Are fish, birds and mammals the same thing?

It depends on how it is classified? What are the classification criteria?

Fish, birds, mammals are all vertebrates. In terms of whether they are vertebrates or not, they are of the same class.

In terms of whether it is a homeothermic animal or not, it is not the same category. Fish are ectotherms, and birds and mammals are homeotherms.

In terms of lifestyle, it is not the same category. Fish are aquatic animals, birds are terrestrial animals, and mammals are both aquatic and terrestrial.

Be. The basic characteristics of fish are to breathe with gills, swim with fins, in vitro fertilization, and oviparous The main characteristics of birds are: beak without teeth, body covered with feathers, forelimbs specialized into wings, long bones hollow, heart up, breathing with lungs, air sacs to assist breathing, constant body temperature, oviparous

Birds belong to the class of birds, there are many kinds of birds, all over the world, ecologically diverse, birds can be divided into three orders: flat-chested, penguins and protruding. There are many species of birds, second only to fish among vertebrates.

In the 21st century, there are more than 9,000 species of birds known to the world, and more than 1,300 species have been recorded in China alone, many of which are endemic to China.

Fishes are ectothermic aquatic vertebrates that swim and feed on the upper and lower jaws by the oscillation of the tail and trunk, by the gill of the gill and the coordination of the fins, and belong to the vertebrate subphylum of the phylum Chordates.

Fish are not mammals, mammals refer to the animals of the subphylum Mammals of the phylum Chordates, vertebrates, also known as mammals, and fish, although they also belong to the subphylum Vertebrates of the phylum Chordates, are not mammalian animals, but are divided into two classes: bony fishes and cartilaginous fishes.

No fish is a mammal. Because fish are oviparous animals, while large mammals are characterized by viviparity, the mode of reproduction is different.

Not all fish are not mammals, for example, whales are mammals, which we often hear about.

1. The body temperature of mammals is between 25 and 37 degrees Celsius, while the body temperature of birds is between 37 and 37 degrees Celsius.

2. Mammals will chew and digest in the mouth, but birds do not have such characteristics.

3. Mammals are viviparous and lactating, which greatly reduces the dependence on the environment during reproduction and ensures a higher survival rate of offspring, while birds are oviparous and have a strong dependence on the environment.

4. Birds have double breathing in order to adapt to flying, but mammals do not have double breathing function.

5. Mammals have coats on their bodies, while birds have feathers.

1. Birds are not mammals.

2. In animal classification, birds are classified into ornichia in the phylum Chordates and subphylum Vertebrates, while mammals are classified into mammals in the phylum Chordates and subphylum Vertebrates.

3. The characteristics of the bird class are: the body is feathered, at a constant temperature, oviparous, and there is an amniotic membrane outside the embryo. The forelimbs are winged, and some species have vestigial wings. Multi-camp flying life.

4. The characteristics of mammals are: whole body coat, constant temperature, viviparity, and amniotic membranes outside the embryo. The diaphragm is a group of vertebrates that secretes milk through the mammary glands to lactate their young.

Some of the birds are lactative, but from the glands in the larynx, they secrete a blood-red milk to feed the young, and the composition is very different from that of milk.

Bats are not birds, because bats are viviparous, mammal, bats do not have alveoli, bats are a special creature, mammals do not have the ability to fly, bats are a special case, and bats have good genes.

Birds are not mammals. Birds are bipedal, homeothermic, oviparous vertebrates, and the most prominent features of mammals are viviparity and their young are fed by the milk secreted by the mother, while birds do not have these two most prominent characteristics and are not mammals.

Birds are a general term for birds that are higher vertebrates adapted to life on land and in the air.

Birds can nest, hatch, brood, and migrate, and there are many species and numbers, and their tracks are all over the world.

There are more than 9,020 species of birds known to exist in the world, and more than 1,400 species in China.

Common characteristics of mammals and birds are:First, they are all vertebrates; Second, the respiratory organs are used in the lungs; Third, the body temperature is relatively constant.

1. Mammals are viviparous, and birds are oviparous.

2. Mammalian hair, birds are feathers and down feathers.

3. Mammals do not have beaks, while birds do.

4. Mammals have a neo-cerebral cortex that birds do not.