their owner, however in certain circumstances, such as petting the back and beneath the wings (in the wild, only the bird's mate will touch a parrot in this manner), the bird may misinterpret this physical contact as sexual behaviour. This may then lead to unwanted hormonal aggression, nesting behaviour and chronic egg laying in pet birds. Most pet parrots take readily to trick training. Trick training can also help to redirect a bird's energy and prevent or correct many behavior problems. Some owners successfully use well behaved parrots as therapy animals. Some owners have trained their parrots to wear parrot harnesses (most easily accomplished with young birds) so that they can be taken to enjoy themselves outdoors in a relatively safe manner without the risk of flying away. Parrots are prey animals and even the tamest pet may fly off if spooked. Although parrots can be messy pets—often throwing food and damaging furniture with their beaks if they can—most parrots may be potty trained to some extent and are generally odorless; however, certain species of Amazona and Pionus have a distinctive odor most owners find pleasant. Most parrot species, with some notable exceptions, are relatively good pets for most pet allergy sufferers. However, all the species of white cockatoos produce large quantities of dust from their powder down feathers, which may be problematic for people with allergies. Cockatiels, rose-breasted cockatoos, and greys also produce smaller amounts of feather dust. Behavior Different species (sometimes even different individuals within species) can vary greatly in temperament, noise, and talking ability. For example, Pionus parrots generally have a reserved stance, while at the other end, large cockatoos need at least several hours of attention daily. The upbringing and genetic inclination of an individual bird plays a major role in determining its disposition, regardless of species. Many of the larger parrots are unsuitable in an apartment setting due to noise level. Although all parrots will make some noise, species that are generally less noisy include parrotlets, budgies, cockatiels, Pyrrhura conures, Pionus, caiques, greys, and usually Poicephalus. Many of the other species of conures can be loud birds. Cockatoos, and many macaws and amazon parrots can be very loud, though normally only at certain times of the day and some birds will learn to scream for attention. Many people are initially attracted to parrots for their ability to talk, sing, and mimic noises they are exposed