Sandhill cranes mate for life, and if it is their first mating season, the bonding begins around the time they get to Nebraska.

BBC: Nebraska��s awe-inspiring crane migration

The movie, directed by George Marshall, pairs Ladd and Lake for the third time, and their coolly enacted mating dance is something to savor.

WSJ: Dark Crimes: Film Noir Thrillers

Now, she added, the post-proposal time period is considered its own step in the mating process.

CNN: STORY HIGHLIGHTS