The Cassowary's large size, its large greyish helmet (casque) and the red wattle hanging from the neck, make it easy to identify. The feathers of the body are black and hair-like. The bare skin of the head and fore-neck is blue, while the rear of the neck is red. Both sexes are similar in appearance, but the female is generally larger than the male, with a taller casque, and is brighter in colour. Young Cassowaries are browner than adults, and have duller coloured head and neck. The chicks are striped yellow and black. If a Cassowary is approached it will generally stand its ground. If the intruder approaches too close, the bird will stretch itself as tall as possible, ruffle its feathers and let at a loud hiss in an attempt to scare the intruder off. The birds are equipped with quite dangerous claws, and will readily attack a persistent intruder, although they usually retreat into the dense rainforest.