Help! What’s wrong with this mockingbird!

As can see from the photos this mockingbird is not in good shape. He gets attacked daily and the adults that attack him dig their claws into him. The poor bird couldn’t defend himself because he was very thin at the time. His feathers were matted and in horrible shape. He has gotten bigger since he has been visiting the peanut butter “swing”.

I also saw an adult mockingbird with no head feathers. It looks like a vulture! This isn’t normal in mockingbirds. (It is normal for blue jays and cardinals to lose their head feathers.) Please help! This is really concerning as there are lots of sick/injured birds in our yard!