Team Red is Ahead in the Color Follies

Budding naturalists are routinely informed that color signals a great deal.  At least with the world of invertebrates, for example, yellow usally signals an unpleasant taste for the prospective predator.  Our world of songbirds is replete with colors.  Meaning? heck, I don't know.  But here's the tote board for my winter buddies.  There are two principal teams.  I'll leave off the browns, blacks, blues and whatever other lesser shades are out there.

Team Red: Northern Cardinal, Downy Woodpecker, Red Bellied Woodpecker, Hairy Woodpecker, and House Finch.

Team Yellow: Pine Warbler, Yellow Rumped Warbler (shown), and White Throated Sparrow,

You tell me: Northern Flicker (red and yellow), Red Winged Blackbird (ditto)

Red has the larger staff with five (or seven?) species, and yellow trails with three (or five).  Does this mean red has some extra special magic?  And why isn't blue, or green more of a pattern outcome?  These are great mysteries.  And some day, perhaps I will arrive, magically, at an idea.