Presented by Jeremy Cherfas Ants are plentiful, and nutritious, but have formidable chemical defences. Tom Eisner , of Cornell University, tells how ant-lions make their prey more palatable, and also sheds light on 'anting' in birds. Some species of tree frogs are visually identical, causing problems at breeding time. Carl Gerhardt , of the University of Missouri, finds that a female frog chooses a mate by taking her own temperature.
Producer MICHAEL BRIGHT BBCBristol