By Victoria Gill, BBC News

媒體英語會帶大家一起學習BBC撰稿人在報道世界大事時常用到的單詞和短語。

Background: 芬蘭科學家最近指出，氣候變化影響該國不同顏色貓頭鷹群體的比例。芬蘭赫爾辛基大學研究人員報告說，在溫暖氣候里，棕色貓頭鷹比灰色貓頭鷹更容易存活。

Despite their name, tawny owls actually come in two colours. And in Finland, the freezing, snowy winters give pale grey birds a camouflage advantage over their darker brown-feathered counterparts. 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.

The lead researcher, Dr Patrik Karell, said that this showed that the birds were evolving in response to climate change, so the tawny owl gene pool is actually getting browner. This is the first evidence of climate change having such an effect in the animal kingdom.