Hot climate produces baby girls

"People who live in the tropics have more baby girls compared with those living in other parts of the world, work reveals.

It may be down to the hotter weather or the longer days, says US researcher Dr Kristen Navara in the Royal Society journal Biology Letters.
She says this climate may change miscarriage rates and sperm quality.
Or there may be some evolutionary advantage to having more girls than boys if you live by the equator.
Research suggests the female foetus is less fragile than the male foetus, which is more prone to the effects of the environment on pregnant women.
At times of extreme environmental stress, including war, the birth rate of girls outstrips that of boys.
Experts have suspected that latitude could have an effect. Past work has shown that the chances of giving birth to a boy increase as you head south - at least in Europe.
But it is difficult to draw conclusions looking at regions in isolation because of wide variations in things like culture, society and economy, to name but a few.
Dr Navara, of the University of Georgia, set out to gain a global perspective by looking a the sex ratios at birth of 202 countries over a 10-year period and taking into account socio-economic differences between nations and continents.
The accepted global average is slightly male biased, at 106 males per 100 females, or 51.5 %.
"The only country in the world which produces more females than males is the Central African Republic," she told the BBC's Network Africa." [BBC Health]