By Laura Ball
January 1, 2017 (La Mesa/Mt. Helix) -- I have very active hummingbird feeders and have noticed a few birds with tumors on their beaks (see photo). I have been in contact with a specialist at the University of California-Davis Vet Med Center about this, and she had some suggestions on how to help them. The hummingbirds probably have avian pox, which is contagious - to birds only, not humans - and can spread through the feeders we all have in our yards.