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Marbled White - Melanargia Galathea by NigelKiteley
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Marbled White - Melanargia Galathea by NigelKiteley
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what had been suspected for half a century, that butterflies don t just flap their wings, but clap them together. theirflexible wings bending to form a cup, or a pocket, of air. when they collapse, this thrust is even stronger and more efficient. it s only now thanks to modern technology and a swedish wind tunnel that we can see it. it s a challenge to work with any living flying animal but with butterflies it s maybe even more because they are smaller, they are fast in their behaviour, difficult to predict their behaviour and also when flying them in a wind tunnel, it s difficult to get them to behave as you want to, when you want to and also to fly where you want them to fly. for a long time, scientists wondered how these creatures could actually avoid predators because of their awkward shape. if you look at their wings, you can see they are very large and broad compared to the size of their body and aren t considered
a new insight into one of the mysteries of the natural world, how butterflies fly despite being equipped with large, inefficient wings. they ve discovered that butterflies cup their wings when taking off. this forms an air pocket that pushes the insect forward at speed, helping it to escape predators. researchers believe the knowledge could prove useful in other spheres, such as making some drones and underwater vehicles more efficient. this is bbc world news, the latest headlines: joe biden and kamala harris lead a ceremony to honour the 400,000 americans who ve died during the pandemic. president trump releases a farewell video on his last day in office before issuing his presidential pardons, including one for key former aide steve bannon. netflix got a big boost from the pandemic last year, as demand for streaming movies and television soared. the company now has more than 200 million paid members, up more than 30% from 2019. about 37 million people subscribed last year, including
if you look at their wings, you can see they are very large and broad compared to the size of their body and aren t considered to be very aerodynamic. but this to make of clapping and cupping now appears to have given them an evolutionary advantage. thinking is this technique developed by the humble butterfly could be applied to modern tech allergy to make drones and underwater vehicles faster, travel further and last for longer. laura foster, bbc news. just a reminder that later today in washington, it will be the inauguration, handover of powerfrom president biden. the time now in washington, just after half past midnight. we are in the final 12 hours of the trump presidency. a changeover at 12 noon exactly local time. changeover at 12 noon exactly localtime. 0f changeover at 12 noon exactly local time. of course, very different inauguration one we have ever seen or be extensive
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