The Derbyan Parakeet, also known as Lord Derby's Parakeet, originates from China and southeastern Tibet.
The female (above left) has an all black beak and the male (above right) has a red upper beak tipped with orange.
The male generally has more strongly-coloured plumage than the female.
Both male and female Derbyans have a large black moustache and a black line across the brow which makes them look as though they are frowning and ill-tempered.
The Derbyan Parakeet is a little similar to the Moustached Parakeet (Psittacula alexandri) - see link below.
They are closely related, as are the other "Psittacula" long-tailed parakeets, the Ring-necked/Rose-ringed and the Alexandrine.