Hi Luke, This looks most likely to be a Carolina Wren nest. Carolina Wrens will build nests is a variety of places (even upturned flowerpots, old boots, coat pockets and more), and usually the nest is messy and has a domed top compared to a typical cup nest. You can learn more about Carolina Wren nests here.
Where did you find them? I believe that they are Cliff Swallow eggs.
Hi Luke, This looks most likely to be a Carolina Wren nest. Carolina Wrens will build nests is a variety of places (even upturned flowerpots, old boots, coat pockets and more), and usually the nest is messy and has a domed top compared to a typical cup nest. You can learn more about Carolina Wren nests here.
Hmm.