A new report just released by the National Wildlife Federation considers climate change to be the greatest threat to migratory birds. Key migratory bird habitat is shrinking and shifting, and the timing of some birds’ journeys is no longer lining up to coincide with when their food sources are abundant. Climate stressors are expected to cause large contractions in the ranges of even some of the common and widespread species we enjoy today. Some bird species will be pushed closer to extinction. Migratory species, such as most birds, face the unique challenge of climate change affecting the multiple habitats they require to breed, migrate and overwinter. Bird ranges are shifting and populations changing. The timing of migration and breeding are changing, affecting the availability of food needed to raise their young.