Do eagles fly south

Yes.

Being predatory animals, eagles are generally very good fliers, which they need to be, to be able to hunt down food.

Some eagle species do a lot of scavenging, and since hunting down dead animals isn't much of a problem, they can manage w/o needing to fly particularly well.

oviously , a eagle can fly then what is the use of feathers and also the eagle flys by the air . thank you