When cleaning out the birdhouse, I discovered these six tiny eggs nestled in a bed of grass, fluff, and plastic. A bit of research showed that Bewick's Wrens nests are lined built with a combination of feathers, wool, hair, or plant down, with a final inner liner of snakeskin; looks like our urban birds used a bit of innovation :^)
NestWatch is one of Cornell Lab of Ornithology's citizen science sites. Check it out for tips on attracting birds to your backyard, birdhouse plans for different species, and for ideal birdhouse placement. Spring is in the air...
From NestWatch on Bewick's Wrens: