"Sandhill Cranes mate for life. One way to identify a mated pair is to witness them giving their unison call. This loud, raucous call is not made by a single bird, but by a pair. One crane initiates the call with a two-note cry. The mate responds with a single note. The back and forth responses are so quick they sound like a single call." -Kim Russell
– 5 x 7" blank card
– Envelope included
