Rooster battles?

My 7 (6? the flock seems to be down to 6 but I
think I've seen 7 still the morning) has some
bloodied white leghorn roosters. They survive
snow and cold just fine but seem intent on killing
each other off.

(Flock dropped off at night a couple of months
ago, by somebody who didn't need more roosters, I
guess. They've been roosting in a Maple at night
and hanging around mostly my backyard.)

There's no hens to provoke this as far as I know.

The instinct to flock seems to be at odds with the
instinct to fight.
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