Morthoron 
Anytime someone mentions David Bowie I think of Labyrinth, can't really describe whether it's a good feeling or bad though.
Also, it's not like these fell beasts were some huge dragon-sized/like creatures as the movies portray. I believe they're even smaller than eagles (or at most roughly the size of eagles)...I mean they were just really large vultures and they stank. Afterall, Legolas shoots one down with a shot and Eowyn decapitates another.