Intrigued by warming winters, researchers from the University of Michigan set out in 1989 to formally measure changes in the geographical distribution of plants and animals in the dense pine and hardwood forests of northern Michigan. Their laboratory, the university’s 10,000-acre Biological Station east of Petoskey, had advanced forestry and natural sciences since the field station’s founding in 1909. Few projects, though, attracted the same level of attention as the migration research.
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