BBC NEWS | UK | Scotland | Edinburgh, East and Fife | No sex for all-girl fish species
A fish species, which is all female, has survived for 70,000 years without reproducing sexually, experts believe.
Scientists from the University of Edinburgh think the Amazon Molly may be employing special genetic survival "tricks" to avoid becoming extinct.
The species, found in Texas and Mexico, interacts with males of other species to trigger its reproduction process.