Twinzy is a "half sider" budgerigar, also known as a parakeet. Has the characteristics of a blue bird on one side and a green bird on the other, even his tail feathers are split down the middle.
Beautiful budgie - a lovely mix of varieties that is very hard to identify, maybe a Skyblue Yellow Face 2 Cinnamon Dilute? Though if tis eyes are red it could be a Skyblue Yellow Face Type 2 Fallow.