This is an example of how living things grow and develop. The caterpillar goes into a cocoon then comes out and has turned into a butterfly. The caterpillar turns into something different than it was before and it is doing different functions.
experiment with sugar and water to see what colors ants prefer - and look at their bellies. You can see what color of sugar water they are drinking. - Might try this with our kids some day! Kind of a neat experiment!
Help kids see how plant grow! (Or if you're short on kids just do it for yourself - it's pretty cool!) :: Science for Kids: Observing Plant Growth with Bulbs (with a FREE printable observation sheet!) from Buggy and Buddy