Contractor Ed Del Grande explains how toilets can sometimes be a two-way street. Link: Experts : Homeowner Issues : The Things We Find in the Toilet : HGTVPro.com
We've found frogs more than once in two different toilets in our own house and a big frog in the shower drain in my mother's house; and tonight on the news a man was interviewed because an iguana showed up in his toilet. (Boca Grande is infested with spiny iguanas.) We had to pull the drain up to get that frog; when I find them in the toilet, I just grab them and put them outside. Sometimes I use our glass critter jar--if they're small enough.