Sparrows

Wikipedia - "Sparrows are a family of small passerine birds. They are also known as true sparrows, or Old World sparrows, names also used for a particular genus of the family, Passer. They are distinct from both the American sparrows, in the family Passerellidae, and from a few other birds sharing their name, such as the Java sparrow of the family Estrildidae. Many species nest on buildings and the house and Eurasian tree sparrows, in particular, inhabit cities in large numbers, so sparrows are among the most familiar of all wild birds. They are primarily seed-eaters, though they also consume small insects. Some species scavenge for food around cities and, like gulls or rock doves will happily eat virtually anything in small quantities. Generally, sparrows are small, plump, brown and grey birds with short tails and stubby, powerful beaks. The differences between sparrow species can be subtle. ..."
Wikipedia
House Sparrow Identification (Video)
Song Sparrow Identification (Video)
Audubon: House Sparrow (Video)
How the house sparrow made its home with humans

The house sparrow’s closeness to humans might have changed its genes, giving it a larger beak and a tolerance for a starchy diet.