Taxonomy and systematics
Two subspecies are universally accepted: * Congo African Grey Parrot (Psittacus erithacus erithacus):
This is the nominate subspecies, larger than the Timneh at about 33 cm (13 in) long, with light-grey feathers, cherry-red tails, and an all-black beak. Immature birds of this subspecies have tails with a darker, duller red towards the tip (Juniper and Parr 1999) until their first moult, which occurs by 18 months of age. These birds also initially have grey irises, which change to a pale yellow colour by the time the bird is a year old. The Congo Grey Parrot is found on the islands of Príncipe and Bioko, and is distributed from southeastern Ivory
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Lipid Pneumonia can be classified as exogenous or endogenous depending on whether or not the animal inhaled outside material. A necropsy shows that the lungs of a Grey Parrot with Endogenous Lipid Pneumonia (EnLP) are firm with a diffuse grey discoloration. EnLP is a common illness in other animals as well. The Congo African Grey Parrot is also one of the three parrots that scientists found to commonly suffer from dehydration. They use Plasma Osmolality to find more information about the form of dehydration the African Grey Parrot has. Often, there is need to find replacement fluids for the Parrots. I added the comment that another disease that a lot of the African Grey Parrots get is cardiomyopathy which is a heart disease that usually presents at a young age. It is believed for the heart disease is genetically inherited from parents of the same breed. Some other common symptoms and illnesses in these birds are weakness, coelomic cavity, and retardation.  The African Grey Parrot has been known to contract Beak and feather disease virus (BFDV) which causes a highly contagious and sometimes fatal, psittacine beak and feather disease in parrots.