Like amazon parrots and macaws, cockatoos frequently develop cloacal papillomas. A great variety of birds can be observed including eagles, toucans, parakeets and macaws. Large parrots such as macaws and cockatoos have powerful beaks designed for crushing large nuts. This occurs in many parrot species, cockatiels, macaws and budgerigars. This small zone houses some of the park's parrot species, mostly macaws, conures and cockatoos. There are nineteen species of parrots documented in the Pantanal, including five species of macaws. Like almost all parrots, the "Ara" macaws are cavity nesters. It is a member of the large group of neotropical parrots known as macaws. Neotropical parrots, macaws, and other are also candidates potential for inclusion. Macadamia seeds are often fed to hyacinth macaws in captivity. There are 19 species of macaws, including extinct and critically endangered species. Limited tool use has been observed in both wild and captive hyacinth macaws. Blue-throated macaws communicate mostly by sound. The majority of macaws are now endangered in the wild and a few are extinct. The colours in the plumage of the "Ara" macaws are spectacular.