Reptiles and Amphibians
Reptiles, like amphibians, make up a fairly small proportion of terrestrial animals—but in the form of dinosaurs, they ruled the earth for over 150 million years. There are four basic types of reptiles: crocodiles and alligators, turtles and tortoises, snakes, and lizards.
Those keeping reptiles or amphibians are affectionately called 'herpers.'
Herpetology includes turtles, snakes, lizards, tortoises, amphisbaenids, crocodiles, toads, frogs, caecilians, newts and salamanders. The name reptile, refers to creeping or crawling animals.
The name amphibian refers to dual modes of existence. For example, frogs are like secret agents looking like a fish in their early life and then grow legs as they become adults.
Amphibians have moist, smooth or rough skin.
Mammals
A mammal is a a warm-blooded vertebrate animal of a class that is distinguished by the possession of hair or fur, the secretion of milk by females for the nourishment of the young, and (typically) the birth of live young.
All mammals have hair, even dolphins and whales that live in the ocean.
Most mammals are helpless when they are babies
All mammals except ant eaters have teeth.
All mammal babies drink milk from their mothers.
Iverterbrates
an animal lacking a backbone, such as an arthropod, mollusk, annelid, coelenterate, etc. The invertebrates constitute an artificial division of the animal kingdom, comprising 95 percent of animal species and about 30 different phyla.
Cnidarians: jellyfish, corals, sea anemones
Annelida: earthworms
Echinodermata—sea star, sea urchins, sea cucumbers.
Arthropoda—insects, ticks, spiders, grasshoppers, lobsters, crabs.