Sandhill Cranes migrating at night

[Duane Nelson]

Birders,

I stepped outside of my house in Las Animas, Bent County CO at 8:28
tonight, and heard a large flock of Sandhill Cranes migrating northward
directly overhead. The moon has not yet risen, and it is very dark. I
can't recall ever hearing Sandhill Cranes migrating at night. Sandhill
Cranes are common spring and fall migrants in this part of the state,
and flocks of thousands stage during the day when the find suitable
roosting habitat.

I had always thought of Sandhill Cranes as diurnal migrants, waiting
until daytime heating creates updrafts to provide the lift they require
for soaring. Perhaps the strong southerly winds provide a clue to their
nocturnal migration.

Duane Nelson

Las Animas, Bent County, CO