Many songbirds migrate at night because cooler air can make sustained flight less taxing, while daytime remains available for resting and feeding. Night skies also reduce encounters with some predators. Birds navigate using several cues, including stars and Earth’s magnetic field; different species may rely on these cues in different ways.
A long journey with daytime foraging
Nocturnal flight lets many small birds cover distance while avoiding the hottest part of the day. After landing, they can rest and refuel. Night migration is especially common among songbirds, though raptors, waterfowl and other groups may migrate during daylight. The pattern is not universal across all birds.
How a bird finds its way
Migrating birds can use celestial cues, including patterns of stars, and geomagnetic information. Research at Cornell has examined how birds orient and when they depart. Light pollution can disorient migrants or attract them into dangerous urban areas, which is why “lights out” programs encourage buildings to reduce nighttime lighting during peak migration. [1]
Weather matters too
Wind direction, clouds and temperature can influence whether and when a bird takes off. Many species show seasonal changes in hormones and behaviour linked to day length. Migration is therefore a coordinated response to season and conditions, not a simple automatic compass heading. See how sea turtles use magnetic fields for a related navigation story.
Do all migrating birds fly at night?
No. Many songbirds do, but numerous species migrate during the day or use both day and night flight.
Sources and evidence
- Cornell Lab of Ornithology — The Basics of Bird Migration ↗
Cornell Lab overview of migration timing, cues and routes.
- PNAS — High-Intensity Urban Light Alters Nocturnal Bird Migration ↗
Research on how artificial light changes nocturnal migration behaviour.
Sources consulted: 11 October 2026. Written with AI assistance and checked against the linked references; not independently reviewed by a subject specialist. Sources do not endorse this article. See our editorial policy.
Revision: Initial publication; the explanation was checked against the linked institutional and research sources.