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They are endothermic animals.
They breath through lungs.
Mammals can be harbivores, carnivores or omnivores(both).
They are viviparous, that means they give birth already developed from inside the mother(not eggs).
Have a very developed nervous system.

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They have different types of glands. The most characteristic are the mammary glands that produce milk to feed their baby.
Mammals are tetrapods, terrestrial mammals have legs, aquatic mammals have fins and flying mammals have wings as front limbs.
Their body is covered by hair or fur that is a good thermal insulator that protects them from humidity.

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Have beack, feathers, wings...
Are fusiform and endothermic(maintain heat).
They breath through lungs.
The things they eat is depending on the beak.
Are oviparous.

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They instead of a teeth they have a beak.
They have feathers on their bodies and scales on their legs.

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Reptiles are ectothermic, they breath through lungs.
Many reptiles are carnivores and hunt they food/prey, but some reptiles have glands with poison that they use it to paralyse their prey before they swallow it.
They are oviparous. Their eggs can be leathery or hard shelled contain sacs that provide food and protection for the embryo. One of this sacs, the amnion is filled with liquid in wich the embryo develops. Eggs with an amnion are amniotic eggs.

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Bilateral symmetry on reptiles:⬆️

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Their scaly skin is tough and dry. They have scales made of keratin that protect them from dehydration and injuries. Many reptiles like lizards and snakes grow new scales below old ones.
They are tetrapods that mean they have four legs and their legs are adapted for walking, climbing or swimming. An exception is the snake

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Here is a video of how a snake(reptile) shed his skin.

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There are two main types of fish one is the cartilaginous fish that have a skeleton made of cartilage this includes the shark.
In this types of fish their gills open directly to the water.

The other type is the bony fish that have a skeleton made of bone. In bony fish the gills are protected by a cover(operculum). This includes the balloonfish.

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Bilateral symmetry on mammals:⬆️

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Bilateral symmetry on birds:⬆️

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The fishes have strong muscles, a backbone, an operculum is a gill that is located near the gills to protect them and their skin is smooth covered by scales.
They are carnivores, so they eat meat. There are exceptions such as the parrotfish.
Are oviparous(lay eggs), the eggs usually hiden so predators don't find them.

And their body temperature change according the environment(Ectothermic)

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The fishes have strong muscles, a backbone, an operculum is a gill that is located near the gills to protect them and their skin is smooth covered by scales.

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Bilateral symmetry on fish:⬆️

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They are cold blooded, and temperature change according to the temperature of their environment.
Breath mainly through their skin which must remain moist for the oxygen to be absorbed in their bodies, they also breath through lungs.
Are oviparous and they lay their eggs in water.
Majority of amphibians are carnivores, but tadpoles are herbivores.

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They have four feet(tetrapods)except when they are tadpoles.
Have a backbone, also they have a thin moist skin and a sticky mocus produced by glands under their skin that helps to stay moist.

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Bilateral symmetry on amphibians:⬆️