"Casque" and "Le Corsaire" arrived at Toulon later. The head has a bony casque, ornamented with crests or tubercles. Jari coloured his prosthetic casque yellow using pigment from his tail gland. The helmet vanga has a particularly large bill with a casque on top. It has an oversized blackish bill with a large casque on top. It has a large bony casque on its head. Juvenile birds are dark sooty-brown with a smaller bill, with an incipient casque. The beak is black and straight and presents a casque, more developed in males. The female has a black face and neck, a yellow casque, and brownish eyes. A 1603 celestial globe by Willem Blaeu depicts it with a casque. A horn-like brown casque, measuring high, sits atop the head. The bill is yellow with a large, mainly black casque. The bill is waxy and the furrows of the casque are brownish. Females have a smaller casque and a black bill. Several functions for the casque have been proposed.