Farming May Have Caused These Birds to Become Darker
The tusk larks of inland Southern California ’s Imperial Valley do n’t look like their forebear . The bird find in the realm today have clearly darker plumage on the tops of their head , their back , and the napes of their necks . But we ’re not talking about a shift that occurred over millions of geezerhood : New inquiry shows that horned lark in the field were lighter just eighty years ago ....