Two of the ubiquitous species in my area during the winter months (well, year-round, really) are the House Finch (above) and House Sparrow (below). Oddly, neither of these species is native to this area. The House Finch is a western species. Its eastern population grew from birds that escaped from the pet trade. The House Sparrow population grew from a series of deliberate releases in the 19th century.