It is commonly assumed that because males produce many, tiny sperm, they are cheap to produce. Recent work, however, suggests that sperm production is not cost-free. If sperm are costly to produce, ...

Humans might show commitment with a ring, penguins offer prospective mates rocks and some beetles gift a ball of dung. Wood-feeding cockroaches show commitment with a nibble of cannibalism — and then ...

WASHINGTON – Scientists have identified the “come hither” scent that female German cockroaches use to lure males, a discovery that may help control one of the world’s most troublesome and resistant ...