I went on a flyer wondering if lunar cycles had anything to do with bird migrations in pulses.
Here is what I learned...
Yes — for certain birds, especially nocturnal insectivores, migration intensity often occurs in synchronized pulses timed to the lunar cycle.
The clearest and best-documented example is the European nightjar (Caprimulgus europaeus). A 2019 study in PLOS Biology (Norevik et al.) used GPS loggers, geolocators, and multi-sensor tags on dozens of individuals tracked between northern Europe and sub-Saharan Africa.
Key findings:
Nightjars more than doubled their nocturnal foraging activity on bright, moonlit nights. As visual hunters of flying insects, they gain a clear feeding advantage under moonlight.
This creates a fueling cycle: birds build reserves most efficiently around the full moon.
Migratory flight nights then peak roughly 11 days after full moon, when foraging opportunities decline.
(see below) In some periods, nearly 100% of the tracked birds departed in the same narrow window — producing clear, population-level pulses of migration rather than a steady trickle.
journals.plos
The authors concluded that the lunar cycle can act as a large-scale temporal regulator that synchronizes the progression of individuals and creates pulses across the migratory population, with potential knock-on effects for ecosystems.
Broader patterns in birds
Related nightjar-family species (e.g., Eastern whip-poor-wills) also show strong avoidance of departing on full-moon nights and adjust timing relative to lunar phase.
Some seabirds increase nocturnal flight or adjust activity with moonlight (e.g., Cory’s shearwaters fly more on moonlit nights during migration; Barau’s petrels show lunar influence on colony returns).
A more recent study on Eurasian skylarks found higher occurrence and abundance of nocturnal migrants on nights with greater moon fraction and moonlight intensity — contrary to the older assumption that small passerines avoid bright nights because of predation risk or poorer star visibility. Visual cues and landscape features may actually help them on moonlit nights.
Nature
Lunar effects are not universal across all bird migrants. Many diurnal or primarily solar-cued species show weaker or no clear lunar pulsing. The strongest signals appear in species whose foraging or orientation benefits (or is constrained) by moonlight, especially long-distance nocturnal migrants that rely on stopover fueling.
In short, the statement holds particularly well for nightjars and certain other lunar-sensitive species: migration is not a continuous flow but can arrive in distinct pulses paced by the moon’s cycle.
It has been 19 days since the last full moon.
You can track precise current data using the
Omni Calculator Moon Phase or view local tracking info via
Time and Date Moon Phases for Vancouver. [
1,
2]
Timeline Details
- Last Full Moon: August 28, 2026, at 04:18 UTC (August 27 at 9:18 p.m. local Vancouver time) — known as the Sturgeon Moon.
- Current Date: September 16, 2026.
- Next Full Moon: September 26, 2026, at 9:49 a.m. local Vancouver time — known as the Corn or Harvest Moon. [1, 2, 3, 4]
The video was release Friday the 11th saying
this happened last Wednesday the 9th.
Guess what? That's
11 days after full moon.
NAILED IT!!!