"On Isle Royale, a remote island national park surrounded by frigid Lake Superior, a thrilling drama is unfolding between wolves and moose, the island's ultimate predator and prey. For over sixty years, in what has been known as the longest study of a predator-prey relationship in the world, scientists have observed the importance of wolves to Isle Royale's unique ecology. But due to illness and underlying factors, the population of wolves on the island has dropped while the number of moose has increased, putting the Isle Royale ecosystem in jeopardy."--
juvenile
text by Nancy F. Castaldo ; photographs by Morgan Heim.
Includes bibliographical references (pages 86-87) and index.
