Red-tailed Black Cockatoos are widely distributed throughout Australia. The south-western population, known as the Forest Red-tailed Black Cockatoo (Calyptorhynchus banksii naso), or Karrak in the Noongar language, is listed as vulnerable, with ‘naso’ referring to its large bill. The Forest Red-tailed Black Cockatoo is the smallest of the five races of Red-tailed Black Cockatoo, weighing 600-610 grams with a length of 53-55 centimetres. The sexes are distinct – males have glossy black plumage with clear scarlet tail panels and a black bill; females have pale greyish bills, yellow-spotted heads and wing coverts and yellow-edged feathers on their belly and breast. This pair of Forest Red-tailed Black Cockatoos were feeding on the seeds of the Marri tree (Corymbia calophylla), cracking open the large woody gumnuts with their massive beaks. This clip shows the female first, then a close-up of the male shredding a gumnut and extracting the seeds.