We are providing this link to “Identification of chewed Marri nuts by cockatoos and parrots” published by the WA Museum.
Many people come to Jirdarup to see the Forest Red-tailed Black and Carnaby’s cockatoos and also see gum nuts on the ground. As this downloadable sheet by the WA Museum shows, it is not that hard to see which cockatoo has been chomping. Enjoy!