Bird Nest

Working on a post-burn survey in Foard, County, Texas, we came across this small bird nest with a single speckled egg. I don't have a clue what species it was but I loved the shape, decor and camouflage! The nest was low in a mesquite tree, larger than a humming bird nest but smaller than a King Bird or Mockingbird. The egg was very Sparrow-like but the nest seemed much neater than a typical sparrow nest. 

Pen and brown ink in Strathmore 400 Series Sketchbook