House Sparrow

The house sparrow is the most widely distributed wild bird in the world, yet I've not photographed one previously (that I recall). While we were recently near Evans, Colorado (northeast of Denver), I photographed some in bushes near a Carl's Jr. while we were waiting for some food. 

The sparrow in the center has the yellow bill, but also a more extensive gray crown and chestnut neck. 

The non-breeding male is streaked-brown, black and buffy above and a yellowish bill. Breeding males have a gray crown, white cheeks, an extensive black bib and a black bill.