A friend of mine went and got some pigeons from someone idk who . He has has them three weeks now and there is one hen that walks around with her wings up and her head almost in the floor .. if he puts her on a perch she flops to the floor .. once on the floor she won't move around . She eats ans drinks ..I helped him give her some antibiotics for a week twice a day and its not helping .. I heard of drop wing or something . what is it.. and how do I treat her .. he has no clue and I'm his last hope... thanks