In his latest paper, he shows that his pigeon-like robot can replicate these ... German scientist Franz Groebbels proposed that this enables birds to fly like "automatic airplanes." ...
The passenger pigeon was once the most numerous bird in the world ... This illustration from the 1870s by Smith Bennett shows passenger pigeons being hunted as they fly over Louisiana. Public domain ...
Pigeons frequently fly into the escalator tunnel at the Clinton ... a “slow response from the Chicago Transit Authority.” A pigeon trapped in the gap between the escalator and tunnel wall ...
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