Varamyr

From A Wiki of Ice and Fire

Varamyr "Sixskins" is a diminutive wildling and a skinchanger who accompanied Mance Rayder's assualt on the Wall. He controls three wolves, a snowbear, and a shadowcat.

After the death of Orell, he took control of Orell's eagle, which still had a remnant of Orell's conciousness inside of it. After Stannis's arrival at the Wall, Varamyr used the eagle to scout Castle Black. Melisandre killed the eagle, causing Varamyr to go insane.