Juncos are a subset of birds within the Emberizidae family we’ve seen so many representatives of already — but the Dark-eyed Juncos set themselves apart from other local sparrows with their dark colour blocked features. At least, that’s true of the ones I’ve seen around here. But, I’ve read that Juncos are one of the most variable of the American sparrows (or buntings, if you’re European — sort of a football soccer situation, since the Old World Sparrows are probably considered ‘true’ sparrows or something across the pond).
Look for these guys along the forest floor, or hiding in shrubs and bushes. I’ve seen them in every park I’ve been to!