HARLINGEN, Texas - Once down to about 15, the world's only naturally migrating flock of whooping cranes has continued its comeback, now numbering a record 237 birds in wintering grounds along Texas' Gulf Coast.
U.S. Fish and Wildlife Service biologist Tom Stehn, who tracks the flock, said 45 cranes were born last year, including a rare seven sets of twins.
He credited the increase to mild weather at their nesting grounds in Wood Buffalo National Park in northern Canada's boreal forest. There, the birds begin their 2,500-mile migration route from their summering grounds to Texas.
"They avoided having that cold weather hit, that just-above-freezing and drizzle that …
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