Invertebrates don't have a backbone and all of them are oviparous.

When invertebrates hatch from their eggs, they are called larvae (singular, larva). Larvae look like small worms: they haven't got any legs, wings or antennae. So, baby invertebrates look very different to adult invertebrates.


Baby and Adult Ants.jpg

Then, how can larvae change into adult invertebrates? They change thanks to a process called metamorphosis. Let's study the metamorphosis of the butterfly:


1 - Egg Stage - Metamorphosis.jpg
EGGS

1 - The first stage is the egg stage. The female butterfly lays eggs on a leaf. The leaf will provide food for the larvae.


2 - Caterpillar Stage - Metamorphosis.jpg
CATERPILLAR

2 - The second stage is when the eggs hatch and the cartepillars come out the eggs. A caterpillar is the larval stage of a butterfly. This stage last from 2 weeks to a month (more or less).

Caterpillars eat lots of leafs and grow very quickly.



3 - Pupa Stage - Metamorphosis.jpg
PUPA

3 - The third stage is the pupa stage. When the caterpillar is fully grown, it stops eating and changes into a pupa (called a chrysalis).

The chrysalis is changing into an adult butterfly.


4 - Adult Stage - Metamorphosis.jpg
ADULT BUTTERFLY

4 - The fourth stage is when the chrysalis opens and the adult butterfly comes out.

Depending on the species, butterflies live from 1 week to 1 month.

This is the complete process:







And what about watching the whole process in a video?





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