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Understanding how hawks land on perches

Harris's Hawk
One of four Harris’s Hawks used in the study. Photo by Angel Sharp Media

Researchers at the University of Oxford have found that hawks control their flight to ensure the safest landing conditions when perching, even if it takes longer and more energy to do so. Understanding how birds optimize their landing maneuvers through learning may help in developing small aircraft capable of perching like birds.

In new research published in Nature, four Harris’s Hawks wearing tiny retroreflective markers were tracked flying back and forth between two perches. Their precise movements were recorded by 20 motion capture cameras positioned around the room, allowing the research team to reconstruct their flight paths on over 1,500 flights. The research team then used computer simulations to understand why the birds chose their particular path to the perch.

Aircraft have the luxury of using a runway for braking after landing to reduce speed. In contrast, birds must brake before they arrive at the perch. However, slowing down to a safe speed while in flight risks stall, leading to a sudden loss of flight control. The researchers discovered that the hawks follow a flight path that slows them down to a safe speed but minimizes the distance from the perch at which they stall. 

Hawks optimize speed and position before landing

To minimize stall, the hawks dived downwards while flapping, before spreading their wings into a gliding posture as they swooped up to the perch. By selecting just the right speed and position from which to swoop up to the perch, the birds were already within grabbing distance of the perch when they stalled, keeping their landings as safe and controllable as possible.

“We found that our birds weren’t optimizing either the time or energy spent, so their swooping trajectories were neither the shortest nor cheapest options for getting from A to B,” said co-lead author Lydia France, from the Department of Biology at the University of Oxford. “Instead, our birds were reducing the distance from the perch at which they stalled and were even better at limiting stall than our simplified computer model.”

“The three juvenile birds flew directly between the perches by flapping for the first few flights of their familiarization period but soon adopted the indirect swooping behavior characteristic of experienced birds,” explained co-lead author Marco KleinHeerenbrink, also from Oxford’s biology department.

A Harris’s Hawk prepares to land on a researcher’s arm. Photo by Rob Bullingham

A critical maneuver

Landing is a critical maneuver, and stalling has been the cause of many aircraft accidents. Looking at birds and asking how they solve the problem of safe landing might help us find new bioinspired design solutions for our own technologies, including small aircraft capable of perching like birds. 

Understanding how birds learn complex motor tasks like landing might also help improve artificial intelligence (AI). When aircraft engineers use computers to solve the problem of perching using a trial-and-error approach to refine the data, it can take tens of hundreds of hours to find an answer. Yet, hawks find an optimized solution over a handful of flights, showing the gap that still exists between natural and artificial intelligence. 

“Motion-capture technology has allowed us to analyze thousands of flights at a time, tackling questions that we never could have done before. Looking forward, this opens the tantalizing possibility of understanding how animals learn complex motor tasks, like learning to fly, and of revolutionizing how robotic systems can do the same,” said senior author Professor Graham Taylor.

The full paper, Optimization of avian perching maneuvers, is available to read in Nature.

Thanks to the University of Oxford for providing this news.

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