1) Bird disease 
[infection] Cause=staphylococcus spp. Bumblefoot (ulcerative pododermatitis) is a bacterial infection and inflammatory reaction on the feet of birds and rodents. This infection is much more likely to occur in captive animals than in those in the wild. == Bumblefoot on birds of prey == Bumblefoot is, perhaps, the largest cause of referral of...
A bacterial corn in the ball of the foot or toes that causes swelling.
a condition typified by sores on the bottom of a bird
Blisters on the hawk's foot caused by trauma
a swelling, sometimes purulent, of the ball of the foot in fowl.