Green-cheeked parrots are common in aviculture and are popular companion parrots. The white cockatoos are more often encountered in aviculture than the black cockatoos. Numerous hybrid macaws exist in aviculture and occasionally occur in the wild. Scarlet-chested parrots are also vulnerable to "Candida" infections in aviculture. Cockatoos are popular birds in aviculture, but their needs are difficult to meet. Conures are commonly bred and kept in aviculture and may live up to 30 years. Trade in Meyer's parrots that have been bred in aviculture is legal. Rose-ringed parakeets are popular as pets and they have a long history in aviculture. This type of parrot is generally called a "conure" in aviculture. It inhabits dry savannah habitats in Australia and adapts readily to aviculture. The term "conure" is now used mostly in aviculture. It is known elsewhere and in aviculture as the green singing finch. The widely distributed common hill myna is the one most frequently seen in aviculture. Chinese bamboo partridges have been part of Chinese aviculture for centuries. Colour mutations have been bred through aviculture.