David Attenborough's Natural Curiosities: Stretched to the Limit

Sir David Attenborough examines the mysteries behind some of nature's most fascinating creatures and plants. Some animals have turned the ordinary into the extraordinary. The giraffe has a stretched neck that has intrigued for centuries, while the chameleon has an elongated tongue that was once thought to be the work of the devil. Today we have a better understanding of how these impressive structures work.