Drakes vs. Roosters

Birds...check
Beautiful...check
Yummy...check
Special abilities...swimming vs. kicking the crap out of everything else in the barnyard (hmmmm)
The kicker...roosters require a 1:12 mating ratio or their hens start losing their back feathers but ducks are good with a 1:1 ratio (although apparently not averse to 1:5)

I dig ducks :P