<i><a href="https://en.wikipedia.org/wiki/en:Colaptes_auratus" class="extiw" title="w:en:Colaptes auratus">Colaptes auratus</a></i> (Northern Flicker) nest. 
Original caption: "No. 13 Nest and five eggs of Flicker in apple tree"
W.L. McAtee
2011-09-20
<i>Birds of the vicinity of the University of Indiana</i>, by W. L. McAtee. 1905. <a rel="nofollow" class="external free" href="https://www.biodiversitylibrary.org/bibliography/30027">https://www.biodiversitylibrary.org/bibliography/30027</a>