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Some threatened UK butterfly species are showing signs of recovery despite an overall decline, annual records have shown.

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 ...

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...

This evening but the role of moths is increasingly being seen as actually crucial in terms of pollination. we know about bees and butterflies but moths work at night and are out of sight and did not get much attention but according to scientists they are doing an incredible job. i thought they would mainly focus on your jumper incredible job. i thought they would mainly focus on yourjumper because we know them for the damage they do to our clothes but in fact they have a huge complex network and travel for miles, how does it work? you are absolutely right, some of them would be interested and ...

To flower said they pollinate things like brambles so we get strawberries and things like that. and they do it and things like that. and they do it and some respects do it more efficiently than bees and butterflies do. and of course they can become food for some predators. that is absolutely right, they are food for other birds and for other predators and as my numbers have declined in the decades sell it to have that numbers of cuckoos in the uk and other parts of the world. so the role as a pollinator and food for different species is critical and they have had many years of bad press but sc...