Professor Tim Birkhead explores sexual selection in the animal world. Tim Birkhead is Professor of Behavioural Ecology at the University of Sheffield. An award-winning teacher and author, Tim has inspired generations of research scientists and wildlife experts.

Informative film by global creative agency Humanstudio, based on statistics from Dr Pacey’s groundbreaking work into sperm and fertility. Watch Dr Pacey's companion lecture, 'The Secret Life of Sperm' to find out more about this fascinating subject.

Fertility expert Dr Allan Pacey presents the incredible truth about this amazing cell. Dr Allan Pacey is Head of Andrology at Sheffield Teaching Hospitals. He also directs a busy clinical laboratory, a sperm bank and a masters course in science communication.