Remember in I think the first movie when the jets turned sideways to fly through narrow cracks? That's what I was reminded of when I saw a report in the Daily Mail of barn swallows navigating a 2-inch crack in a door at 35 mph. I've often looked out our back window and watched songbirds navigating through the branches of trees at high speed, but this example is even more impressive. Details and more pix at the link.
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