As part of the project, now in its fifth year, cranes hatched in captivity at the Patuxent Wildlife Research Center in Maryland have been raised at the Necedah refuge and led south by ultralight aircraft in the fall to the Chassahowitzka National Wildlife Refuge near Crystal River, Fla. They migrate back north on their own in the spring.
The flock now numbers about 60 birds, with 22 newly hatched young ones being raised for release this fall....
The only other migrating flock of whooping cranes numbers about 200 birds. They fly from Canada to winter on the Texas Gulf Coast. The whooping crane, the tallest bird in North America, was near extinction in 1941, with only about 20 left.

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