The gray cockatiel is the most common type of cockatiel. The cockatiel pictured above is female, because it has a white / yellow tail and has mostly light yellow feathers on its head and neck.

The cinnamon cockatiel has developed a gene mutation which has turned its gray feathers into a light brown. The color of these birds can range from a very light brown to a rich chocolate brown.

The Fallow Cockatiel is very similar to the Cinnamon cockatiel, except it is slightly lighter and less "brown" than the cinnamon cockatiel.

Lutino Cockatiels can either be totally yellow or totally white with a yellow head and bright orange cheeks. Lutinos usually have red or maroon colored eyes and their cheeks are extremely pronounced.

Pearl Cockatiels have a distinct "brushed" effect on their wings and back. This can be seen above with gray and white feathers mixing in a criss-cross pattern.

The pied cockatiel has a lot more light pigment in its genes, giving it a very distinctive white & dark color scheme. The pied cockatiel is impossible to sex visually.

The White Faced Cockatiel is arguably the most beautiful of all the cockatiels. It's lovely contrasting white and dark plumage is extremely pleasant to look at and adore.