The K&H Thermo-Perch is the answer to protect exotic birds from the harmful effects of air conditioning and cold drafts. The Thermo-Perch provides a safe, consistent heat source, stabilizing the bird's environment.Sizes:Small: For Finches, Cockatiels, Parakeets, CanariesMedium: For Amazons, African Greys, Pionus ParrotLarge: For Macaws, large Cockatoos, Toucans