All animals can be classified as belonging to one of two groups:

Those with backbones.

Those without backbones.

Animals without backbones are called INVERTEBRATES.

There are many different types of invertebrates such as:

sponges

anemone, jellyfish

worms

snails, clams and octopuses

starfish

insects, spiders, ticks

ArthropodsInsects They have got three main

body parts: the head, the thorax and the abdomen.

They have got six legs and two antennae.

Many insects have got wings like the butterfly, fly, bee, ant......

ArthropodsArachnids They have got eight legs.

They haven't got antennae.

They can live in land or fresh water.

Some examples of arachnids are spiders, scorpions, mites and ticks.

Snails and slugs

They have got soft bodies. They haven't got legs. They have got two antennae. Snails have also got a shell.

Worms

They have got soft bodies. They haven't got legs, a shell or atennae. They can be flat, round or segmented. Earthworms live under the ground.

Most invertebrates lay eggs. They're oviparous creatures.

The mother lays lots of eggs. The larvae come out of the eggs. The larvae become adults. The larvae grow and change.

Some insect larvae change a lot when they grow.

METAMORPHOSIS1. A butterfly lays eggs.

2. The butterfly larvae come out of the eggs.

3. The larvae are called caterpillars. They eat lots of leaves.

4. The caterpillar makes a special covering. It's called a cocoon.

5. When they come out of the cocoon, they're butterflies.

Metamorphosis

eggs larva

butterflypupa