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They construct nests of bulrush and lay one to three eggs, (usually two) in late April and early May. The incubation period is about 29 to 31 days. Whooping cranes will renest if the first clutch is lost or destroyed before mid-incubation.Both sexes share incubation and brood-rearing duties. Despite the fact that most pairs lay two eggs, seldom does more than one chick reach fledging.he life span is estimated to be 22 to 24 years in the wild. Whooping cranes are omnivorous feeders. They feed on insects, frogs, rodents, small birds, minnows, and berries in the summer. In the winter, they focus on predominantly animal foods, especially blue crabs and clams.
Based on past research, approximately 90% of the nest will contain 2 eggs, 9% will contain 1 egg and 1% will contain 3 eggs. Eggs average 100 mm in length and 63 mm in width. Whooping crane pairs share in incubation of the eggs.Incubation lasts from 29 to 31 days.ortunately, egg predation is uncommon, and re-nesting by whooping cranes is believed to be rare. So, normally whooping cranes usually produce clutches of 2 eggs laid 48 to 60 hours apart. Incubation begins with the first egg laid. Therefore, hatching of the eggs does not occur at the same time.