| Pisces | Amphibia | Reptilia | Aves | Mammalia | |
| Habitat | Aquatic | Both land and water |
Some terrestrial, others aquatic |
Terrestrial (aerial) |
Usually terrestrial, few aquatic. |
| Skin | Covered with scales/plates |
Smooth skin with mucus glands and lacking scales |
Waterproof skin with scales |
Mostly covered with feathers |
Covered with hair and contains sweat and oil glands. |
| Body Temperature Control |
Cold blooded | Cold blooded | Cold blooded | Warm blooded | Warm blooded |
| No. of heart chambers |
2 | 3 | 3 (except crocodiles) | 4 | 4 |
| Respiration | Gills | Gills, lungs or skin |
Lungs | Lungs | Lungs |
| Mode of Reproduction |
Oviparous (egg laying) | Oviparous | Oviparous | Oviparous | Viviparous |
| Locomotion | Tail and fins | Limbs | Limbs | Wings | Limbs |
| Examples | Rohu, shark, sea-horse, sting ray |
Frog, Toad salamander, |
Crocodile, snake, turtle, lizard |
Pigeon, ostrich, hen, duck |
Human, whale, bat, lion |
