Here's what some of the children have said about the caterpillars.

"The catrepillar will turn into a butterfly."

"They are big."

"They are growing."

"The caterpillars are wriggly."

"They are climbing up the jar."

"They are growing bigger and bigger."

"They are getting longer and fat."

"They have got prickles on the back."

"They are spikey."

"This one has been eating all the food."