Migration is much more complex than just flying south for winter. Many of the birds we observe here in our region are responding to the mysterious fluctuations of seed crops all across the boreal belt into Canada. Some birds erupt southwards unpredictably as seeds ripen. Each species has favorite foods: redpoles look for birch catkins, grossbeaks, and pine siskins look for sprucecones and pinecones. Acorn, beechnuts, and hazelnuts attract jays. Mark Faherty, ornithologist and naturalist at Mass Audubon Wellfleet Bay Wildlife Sanctuary joins our host Mindy Todd to catch us up on all this and more on The Point.