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the next three years,he did almost constant field work that took him from Texas up the cranes'migration route to Nebraska,and on into Saskatchewan in search of the nesting grounds of the birds. Studying the bird in its breeding habitat and seeing how many birds were born would allow conservationists to understand how to help the birds on their journey.But finding the whooping crane's nesting sites meant difficult and fruitless air searches over northern Canada. In 1952,Allen wrote a report on the whooping crane.The report was a warning call to the conservation community:only 33 migratory "whoopers"remained,and their nesting sites still hadn't been found.Two years later,the whooping cranes'breed-