Other March events  Golden eagles lay their eggs in nests
located high on cliff faces in the foothills and mountains.
Mountain and western bluebirds gather in flocks on the plains
before moving up into the foothills to nest. Migrating snow
geese fly high overhead.  American white pelicans have already
returned. Twenty-five were seen on Panama Reservoir, south of
Longmont, on Sunday.  Black-tailed prairie dogs are born. They
come up to the surface in about four weeks and attain full size
in about six months. Our prairie dogs generally produce only one
litter of three to seven young.  Chorus frogs chirrup and mate
in prairie wetlands.  We know that winter is ebbing in Boulder
County when we see white-flanked ducks cruising along the edges
of ice floes on our thawing lakes and ponds.  Some of these male
goldeneyes, buffleheads and mergansers have wintered here, but
most have flown up from Texas and New Mexico.  Racing northward
with the thawing ice gives these ducks a chance to stake out the
best breeding terri