The Riddle of the Rook
The rook is a bird which almost everyone knows - but knows almost nothing about. For example, how do these mysterious birds control their own numbers with such efficiency? Year after year some farmers kill every young rook on their land only to find that, come winter, the rook population has doubled.
This is a riddle that scientists are still trying to solve.
Director and narrator
HUGH FALKUS
Scientific editor PROF NIKO TINBERGEN Presented by CHRISTOPHER PARSONS (Bristol)