The yellow hammer or yellow bunting (Emberiza citrinella) is a British and north European species of bunting. The birds are about sixteen centimetres long, the general colouring mottled brown above and yellow below, the head being yellow, streaked with brown, and the rump and tail coverts chestnut. The food is chiefly insects and fruits, especially blackberries in autumn. The nest is placed usually upon the ground and contains four or five eggs. Research Yellow Hammer