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Hovver Bovver

The first time researchers have directly measured the impact of moving visual patterns on free flight in birds.

hummingbird by © Matthew Shain 2014

[dropcap style=”font-size:100px; color:#992211;”]Y[/dropcap]ou thought it was going to be yet another article about getting a drone for Christmas, didn’t ya?

Indeed no. Before teenage lads were buzzing the ladies’ changing rooms with creepcopters, there was nature’s own hovering entity – the hummingbird. Achingly beautiful, biologically unparallelled, aerodynamically unequalled. Scientists still can’t figure out how the flight of the hummingbird works but….

They’ve figured out how to break it. Hooray!

Hummingbirds’ remarkable ability to hover in place is highly contingent on the tiny bird having a completely stationary visual field, according to University of British Columbia research published in the Proceedings of the National Academy of Sciences.hummingbird by  © Matthew Shain 2014

UBC zoologists Benjamin Goller and Douglas Altshuler projected moving spiral and striped patterns in front of free-flying hummingbirds attempting to feed from a stationary feeder.

Even minimal background pattern motion caused the hummingbirds to lose positional stability and drift. Giving the birds time to get used to the stimuli didn’t eliminate the disruption. Projecting a combination of moving and stationary patterns in front of the birds didn’t help either, although birds were able to regain some stability.

“We were very surprised to see how strong and lasting the disruption was — birds with hovering and feeding abilities fine-tuned to the millimetre were off the mark by a centimetre,” said Goller. “We think the hummingbird’s brain is so precisely wired to process movement in its field of vision that it gets overwhelmed by even small stimuli during hovering.”

It’s the first time researchers have directly measured the impact of moving visual patterns on free flight in birds.

“Our brains interpret visual motion based on our current circumstances,” says Altshuler. “We react very differently to sideways movement in a parked car than while driving. Now we want to investigate how birds use vision during transitions from mode to mode, for example as they move from hovering to forward flight.”

Source: University of British Columbia
Image: © Matthew Shain 2014


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