Although sometimes disliked because they chase smaller birds away from feeders, Blue Jays are among the handsomest of birds. They often bury seeds and acorns, and since many are never retrieved they are, in effect, tree planters. They regularly mob predators, and their raucous screaming makes it easy to locate a hawk or a roosting owl. Although seen all year, they are migratory and travel in large loose flocks in spring and fall. Birds from farther north replace local populations in winter.  The Blue Jay is also the official bird of Prince Edward Island.