Red-Tailed Black Cockatoos are a large (50cm) tropical cockatoo (Calptorhynchus banksii). It may or may not be a surprise that the species is named for the males, which are indeed black and have bright red tail panels; they also have a large crest, as in the first image. Females are not black, with extensive yellow spotting (as in the partly obscured bird in the second image) and have yellow/orange tail panels. They are noisy and gregarious, moving around in groups until they find a fruiting tree, which they then leisurely de-fruit.
Z50II with 28-400, processed in Nitro.