Today, the landscape is vastly different.

That's why scientists are seeking examples of evolutionary changes coded in species' DNA that are heritable,long-lasting,and may provide a key to their future.Take the tawny owl.If you were walking through a wintry forest in northern Europe 30 years ago,chances are you'd have heard,rather than seen,this elusive bird.Against the snowy backdrop,it's plumage would have been near impossible to spot.Today, the landscape is vastly different.