While it's not considered unusual for one or two cans to strike out on their own to scout the migration route for the main herd [flock? cluster? tinning?], this 'is' a bit early in the season. Being naturally armored as they are, they can withstand the drops in temperature better then the females of the species who are smaller and encased only in plasticized foil wrap.
It's truly one of Mother Nature's rare and wonderful gifts to see the first cans quietly slip over the ridge line and start moving down into the fog kissed valleys at dawn.