Background: 芬兰科学家最近指出，气候变化影响该国不同颜色猫头鹰群体的比例。芬兰赫尔辛基大学研究人员报告说，在温暖气候里，棕色猫头鹰比灰色猫头鹰更容易存活。

Despite their name, tawny owls actually come in two colours. And in Finland, the freezing, snowy winters give pale grey birds acamouflage advantage over their darker brown-featheredcounterparts. But as the Finnish winters get milder, the grey owls are disappearing.

The University of Helsinki team gathered 30 years' worth of genetic and population data on tawny owls. They found that the birds inherited their plumage colour from their parents. The grey tawnys, as well being better hidden from predators in the snow, seem to be endowed with other genetic advantages that make them healthier and stronger. But despite this, the brown owl population is now overtaking that of the greys, because the warmer winters have improved the brown owls' chances of survival.