[EBB Sightings] parsing rails, Arrowhead on Sunday, Briones on Saturday

I was out at Arrowhead this afternoon with Sarah Hawley, and we saw
rails (hooray!) but weren't quite sure whether they were Clapper Rails
or Virginia Rails.  The pictures in the Sibley and Audubon guides
seemed quite different.  The ones we saw didn't seem to have the
grey/blue faces of the Virginia, but their weren't exactly rufous
either.  The bills seemed strikingly orange, but that doesn't seem to
be listed as a diagnostic feature in either guide.  Any surefire ways
to tell these two apart?

Two kind folks with a scope also pointed out a very odd Green-winged
Teal in a small flock of conventional Green-winged Teal.  It looked
mostly like a female, but it had a large dark band on its head just
like a male, except darker brown rather than green.  A juvenile,
perhaps?  The guides were unhelpful.  Other than that a pretty usual
assemblage out there, plus an Eared Grebe and a Greater Yellowlegs,
which were our ID achievements of the day (we're both still learning).

I was also out in Briones on Saturday, where I saw Red-breasted
Sapsuckers, Acorn Woodpeckers, White-breasted Nuthatches,
Chestnut-backed Chickadees, and Western Bluebirds, House Finches, and
Yellow-rumped Warblers, all of which are pretty standard for the oak
savannah, I guess, but they made for a very colorful afternoon!

-Ken-ichi