Life cycle of a caterpillar

The life cycle of a caterpillar has  four level. 

First
The caterpillar starts from an egg then hatches into a long caterpillar.

Secondly 
The caterpillar eats all it can then turns into a pupa(chrysalis).      

Thirdly
The pupa(chrysalis) when summer comes the pupa(chrysalis) opens. 

Lastly 
The pupa(chrysalis) opens then out comes a butterfly .