Pam, my teil does that sometimes too although he is a male! He rests his tail up against the side of the cage and hisses at me if I disturb him--I'm thinking its just a silly thing they do or maybe it feels good to them--sorry to be so blunt--hehe!! If your bird does continue to spend alot of time on bottom of cage or shows any signs of weakness or change in appitite, however, I would call the vet! Lydia*