Here’s what you’ll learn when you read this story:Tracking bald eagle migrations for several years revealed that the birds begin to fly north in the summer and fly south again in the winter. While these migratory tendencies are associated with breeding, non-breeding birds were also found to exhibit the same behavior. Many begin to search for tree branches or brush by the water to nest in as breeding season approaches. Each position in navigation monitored by the GPS trackers was identified as one of three phases: post-fledgling dependence, migration period, and breeding season. “Our results contribute to a growing understanding of avian migration routes within the Pacific Flyway and the diverse migration strategies,” Cappello said, “including northward migration following the breeding season, exhibited across raptor populations.”