A caterpillar changing into a butterfly (metamorphosis) is an example of chemical change. It is irreversible.
The caterpillar that becomes the monarch butterfly is about 2mm long when it hatches from its egg. In the following two weeks, it increases it's "birth" weight by 3000 times. Which is like an 8lb baby growing to 10 tonnes in two weeks (that's the weight of about 5 cars!!!) No wonder it needs to shed its skin three or four times in such a short time.
Want to know more?
