91av

If you enjoyed Tim Birkhead’s recent feature for 91av(24
June, p 28), and would like to find out more about cryptic female choice and
sperm competition, turn to his new book Promiscuity. It will open your
eyes to the extraordinary ways in which both sexes have evolved to get their own
way. Published by Faber and Faber, £9.99, ISBN 0571193609.