Hummingbirds are natural acrobats, twisting their wings in ways that let them fly backward and upside down, unlike any other bird (SN: 1/13/16). New high-speed video now shows how, using a bit of aerial gymnastics, hummingbirds can also slip through gaps narrower than their wingspan.
Anna’s hummingbirds (Calypte anna) fly sideways to make it through holes too small for their rigid wings, researchers report November 9 in Journal of Experimental Biology. To avoid hitting a hole’s sides, the birds also flutter their wings while flying through a tight space rather than using their full range of motion for each wingbeat. After successfully navigating the obstacle a few times, the birds switch it up, flattening their wings against their bodies and shooting through holes like a bullet.
“This is a new insight into the amazing capacity of hummingbirds,” says Bret Tobalske, a biomechanist at the University of Montana in Missoula who wasn’t involved with the research. Sideways flight to maneuver through gaps is “pretty remarkable” and highlights how unique hummingbirds are among birds, he says.
The findings could help engineers develop aerial vehicles or robots suitable for navigating tight, complicated spaces. Hummingbirds are among nature’s best fliers and are fantastic at remembering their spatial environment, says Bo Cheng, a mechanical engineer at Penn State not involved in the study. But “the state of the art in drones hasn’t really reached the hummingbird-level flight capability yet,” he says. The rapid beat of hummingbird wings — around 40 beats per second for an Anna’s hummingbird — gives the birds precise control over flight, and engineering needs to catch up.
2023-11-09 18:00:00
Original from www.sciencenews.org
