Soh Kam YungCool.
"In a study published in Ornithology, researchers describe how they used thermal imaging optics, flashlights, and high-speed photography to detect and photograph birds in flight after dark. The technique allowed scientists to identify low-flying species across three fall seasons in Cape May, New Jersey—including thousands that would have gone undetected by other monitoring tools."
https://phys.org/news/2026-03-reveals-technique-individual-night-flying.html
Study reveals new technique to identify individual night-flying birds for the first time
Millions of birds invisibly migrate through the night sky each autumn, most flying in near silence toward their wintering grounds. Now, scientists have developed a way to see and identify many of those birds for the first time.