While some of this can be explained by society—in countries like China baby boys are favoured and many unborn girls are electively aborted—there are natural processes at work.
Conservationists started an artificial breeding programme, using eggs from the females and sperm from Suni to produce an embryo – an unborn animal in the very early stages of development.
Scientists, believe it, are finding soot in mothers placentas, meaning unborn babies are directly exposed to the black carbon produced by motor traffic and fuel burning.
It's now known that an unborn child can be affected if the food eaten by its mother contains high levels of mercury, and these effects can be quite substantial.
" Nearly 40 percent of pregnant women decrease or stop taking asthma medication because they are worried that it could be harmful to their unborn babies, " said Teresa To in a statement.