The sweet, lazy whistles of Eastern Meadowlarks waft over summer grasslands and farms in eastern North America. The birds themselves sing from fenceposts and telephone lines or stalk through the grasses, probing the ground for insects with their long, sharp bills. On the ground, their brown-and-black dappled upperparts camouflage the birds among dirt clods and dry grasses. But up on perches, they reveal bright-yellow underparts and a striking black chevron across the chest.