Butterfly shows evolution at work
‘Scientists say they have seen one of the fastest evolutionary changes ever observed in a species of butterfly.
The tropical Blue Moon butterfly has developed a way of fighting back against parasitic bacteria.
Six years ago, males accounted for just 1% of the Blue Moon population on two islands in the South Pacific.
But by last year, the butterflies had developed a gene to keep the bacteria in check and male numbers were up to about 40% of the population.’