I had a grey tree frog come into the house when I brought the orchids in last fall. Didn't find her on the plants until well after it got too cold to turn her loose outside, so she spent the winter on the orchids on the windowsill, feasting on houseflies and bathing in the water that collected in the leaves of a large bromeliad. The housecats never even noticed she was around for the whole winter....
Once spring rolled around she went back out with the orchids....