While human food will make Cockatoos sick and may kill them, wild birdseed mix encourages Cockatoos, King Parrots, and other wildlife to become dependent on humans for their survival and may cause nutrient deficiencies. Birds need to teach their young how to forage for a wide variety of natural foods. Feeding also allows for the easy spread of disease particularly from bird to bird (such as Psittacine Beak & Feather Disease). The other big problem with feeding cockatoos is that it encourages pests such as mice, rats and introduced bird species, as well as predators such as feral cats and foxes. The very best thing you can do for our Australian wildlife is to not feed them!