Bird calls can be loud, even those made by small species. Dr Alex Bond, the Museum's Senior Curator in Charge of Birds, explains how birds make such big and melodic sounds. ---------------- The Natural History Museum in London is home to over 80 million objects, including meteorites, dinosaur bones and a giant squid. Our channel brings the Museum to you - from what goes on behind the scenes to surprising science and stories from our scientists. Subscribe to our channel for the latest films and live broadcasts about the natural world null Browse our shop: https://www.nhmshop.co.uk/ Website: http://www.nhm.ac.uk/ Twitter: http://twitter.com/NHM_London Facebook: http://fb.com/naturalhistorymuseum Instagram: http://instagram.com/natural_history_museum