Eighty percent of hens nest within 4 miles of the lek they attend.
Hens lay 2 eggs in 3 days; clutch size ranges from 7 to 9.
Incubation is 28 days.
Nesting dates ranged from April 22 to July 10 in one study in Montana.
The chick chips its way through the eggshell with an egg tooth, a temporary tip on its bill that helps the chick break the shell. The chick hatches after 1 to 2 days of pecking circular fractures around the large end of the egg, finally penetrating it.
Circumference of large end is broken.
Membrane remains behind.
Membrane is gone.
Eggs are broken at center, pushed in from outside, or in the case of snakes, swallowed whole leaving no evidence.