Noticed the questions and comments on visible bird breath. Actually
it's quite common, if one looks carefully at, say, feeder birds
when the temp is minus 20 f. or lower. Small but descernable puffs
of breath show on them and frost forms at the base of the bill and on
the "whiskers". You guys don't have temps like that out there in the
NW (and aren't you pleased), so bird breath is not noticable. We
also have a dozen chickens for eggs and in their coop, in the winter,
their breath is obvious. And finally, here in my town we have
something called the Ottertail River that remains open in the winter
thanks to warm water discharge from an electrical generating plant.
Trumpeter Swans, about 30-40, from a reintroduction project,
demonstrate visible breath when it's cold out.