Phenology of nocturnal avian migration has shifted at the continental scale

Nature Climate Change, Published online: 16 December 2019; doi:10.1038/s41558-019-0648-9

Climate change affects the timing of bird migration, which can lead to mismatch with resource availability. Migration occurred earlier in spring and autumn in the United States during the past 24 years; warming led to later arrival in the western Unites States and earlier arrival in the rest of the country.