Scientists Have Tried Raising Endangered Whooping Cranes in Captivity by Using

Scientists have tried raising endangered whooping cranes in captivity by using sandhill cranes as foster parents. Which fact prompted this strategy to be abandoned?

A) the fostered whooping cranes' critical period was variable such that different chicks imprinted on different "mothers"
B) sandhill crane parents rejected their fostered whooping crane chicks soon after incubation
C) none of the fostered whooping cranes formed a pair-bond with a whooping crane mate
D) sandhill crane parents did not properly incubate whooping crane eggs

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