The purpose of this experiment is to determine whether iron is safe to feed to frogs. We expect that frogs need iron in their diet, and that iron is safe to include in frog food. One frog.
One fish tank.
Several small iron hex nuts. We carefully opened the frog's mouth and inserted several hex nuts. After determining that the procedure had not harmed the frog, we returned the frog to the fish tank. The frog seemed to like the bottom of the tank. In fact, he stopped visiting the upper part of the tank altogether. The next day, the frog was found inert and unmoving exactly where we had left him. The hypothesis was not confirmed.

Iron is toxic to frogs. Next Experiment