A cloud of tiny helium-filled soap bubbles hovers in the air. When a barn owl glides through them, the bubbles are illuminated and recorded. The experiment is repeated with a tawny owl and a northern goshawk. With this setup, researchers can see, track, and analyze the vortices in each bird’s wake.

This film is from the bird video selection of The kids should see this. If no film or link appears below, go to the blog to view it by clicking on the blog title above. If the film stops & starts in an annoying manner, press pause (lower left double bars ||) to let it buffer and get ahead of you.   [Chuck Almdale]

https://thekidshouldseethis.com/post/birds-gliding-through-helium-bubbles-reveal-an-aerodynamic-trick