Remove any uneaten food promptly. As tadpoles become frogs, their diet changes from eating plants to feeding exclusively on live animals such as insects and small crustaceans. It's a real challenge to find enough food to maintain most juvenile frogs for very long. Tiny meal worms or aphids from infested houseplants are your best bet, but you might want to simply release the little frogs to ensure their survival. Have students record transformation to adult stages.
Tadpoles undergo three remarkable changes that are easy to observe.
Second, they slowly lose their tails. As the front legs grow, the tadpoles will no longer eat. The tail shrinks as the tissue is reabsorbed as food by the tadpole. Finally, the tadpole switches from breathing with gills to breathing with lungs after it grows legs. Have students record daily observations and document how long it takes for each stage to occur.