Bird migration

Bird migration is the regular movement of birds between breeding and nonbreeding areas, often with a return journey. It ranges from short local movements to journeys spanning continents and oceans.

Avian navigation: The sensory and cognitive processes birds use to determine direction and position. Birds combine several cues to orient along routes and find destinations.
Breeding season: The period when animals reproduce and raise offspring. Breeding schedules help define when many populations depart for nonbreeding areas.
Bird conservation: The protection and management of wild bird populations and their habitats. Migrants require coordinated conservation across multiple seasonal ranges.
Bird irruption: An irregular, often large-scale movement of birds beyond their usual range, commonly linked to food shortages. Irruptions are exceptional responses, unlike recurring seasonal migrations.
Climate change and bird migration: The effects of climate change on the timing, routes, and outcomes of bird migration. Warming can shift seasonal cues and alter conditions across a route.
Bird migration routes: Recurring pathways followed by migrating birds between seasonal ranges. Routes concentrate movement through geographic corridors and bottlenecks.
Nonbreeding season: The part of an annual cycle outside the breeding period. The nonbreeding range is the destination for many seasonal migrations.
Important Bird and Biodiversity Areas: Sites identified as globally important for the conservation of birds and biodiversity. Many designated sites protect migration bottlenecks and essential stopover habitat.
Bird dispersal: The movement of individuals away from their birthplace or breeding site. Dispersal is generally a one-way change of location, not a regular return journey.
Phenological mismatch: A timing gap between interacting organisms whose seasonal cycles respond differently to environmental change. Migrants may arrive after peak food availability if departure and resource timing shift unequally.

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