Mutant Bird

Mutant Birds from the 2008 movie Flu Bird Horror.

Appearance
They barely look like birds any more. They now have bat-like wings and shorter beaks. They now have an almost humanoid shape. They carry a most likely fatal disease. They are most likely mutant vultures

Disease
Anyone who touches them contracts a disease. Symptoms include the skin taking on a greenish tint, veins becoming visible and a lot of bleeding.