Cockatoos that appear to have been painted blue, yellow, green and pink have been spotted in Sydney's eastern suburbs.

Residents have reported seeing the abnormally coloured sulphur-crested cockatoos in parks, trees and backyards in Watsons Bay, Rose Bay and North Bondi.

A blue cockatoo has been enjoying a feed on Kim Novick's North Bondi balcony. Credit:Kim Novick

Some of the birds are covered with a single colour, but others have a tie-dye appearance with multiple shades through their feathers.

North Bondi resident Kim Novick said she was startled when she saw a bright blue cockatoo among the flock she fed on her balcony each day.