The salamander (a lizard-like animal) belongs to the class of reptiles (reptilia) under vertebrates.

A home for fish is known as an aquarium.

 The bat (a nocturnal bird-like flying animal) belongs to the class of mammals (mammalia) under vertebrates whereas the eagle, hawk, kingfisher and swallow belong to the class of birds (aves) under vertebrates.

The peregrine falcon (a kind of falcon like a hawk) belongs to the class of birds (aves) under vertebrates.

The female mosquito is known to feed on blood.

The lungs expand when the diaphragm falls and contract when the diaphragm rises.  

Diatoms (kinds of minute unicellular water plants) are the tiny plants that small water animals feed on.

The duck (a water bird having a broad blunt bill or beak and webbed feet) does utilize its beak for straining muddy water.
The eagle, woodpecker, wren and heron do not use their beaks for this purpose.

Elver (an aquatic animal) is a young eel which is a fish, whereas leech (a small blood-sucking worm) and newt (a small amphibious creature like a lizard) are not fishes.

The salmon (a large edible fish having pinkish flesh) belongs to the class of fish (pisces) under vertebrates.

A home for ants is known as a formicarium.

The gnat (a small biting fly) is an insect.
The mussel, shrimp, snail and water-flea are not insects.

The house-fly (a large biting fly) possesses compound eyes.
The earthworm, ringworm, tapeworm and hookworm do not have compound eyes.

A marsupial is a mammal that carries its young in a pouch.
A kangaroo (an Australian mammal having a pouch to carry its young and strong hind legs for jumping) is a marsupial.
The tapir, whale, seal and giraffe are not marsupials.

The male mosquito is known to feed on plant juices.

The whale (a very large sea animal) belongs to the class of mammals (mammalia) under vertebrates.

Man can be classified as a vertebrate which is an omnivore and is not stationary.
The sea anemone, jellyfish, oyster and lobster cannot be classified as vertebrates which are omnivorous and not stationary.

The bodily changes (the changes in form or character) that occur in the life spans of insects and amphibians are scientifically known as metamorphosis.

The ovum (a reproductive egg cell) is an unfertilized egg.

The bees present in gardens pollinate the flowers there.
They help us by aiding in the process of pollination, which ensures that the flower fertilizes and then reproduces and that fruits will be formed.

A home for reptiles and amphibians is known as a vivarium.

The turtle (a sea creature like a tortoise) belongs to the class of reptiles (reptilia) under vertebrates.

The salmon travels from the sea up a river to spawn (deposit its eggs).
The oyster, lemming, salamander and newt do not show this characteristic.

The shrimp is an invertebrate (an animal without a backbone) whereas the piranha, eagle, lizard and newt are all vertebrates (animals having a backbone).

The snake is a vertebrate (an animal having a backbone) whereas the earthworm, butterfly, spider and snail are all invertebrates (animals without a backbone).
Some other examples of invertebrates are the tapeworm, leech, centipede, millipede, crab, shrimp, house-fly, star-fish, amoeba and hydra

The tsetse fly (an African fly that transmits disease by its bite) is the insect that carries the parasite causing sleeping sickness.

Every animal can be fundamentally classified either as a vertebrate or as an invertebrates.