Northern flickerWe spotted this male northern flicker near a nest cavity with three young peeking out. Photo by Courtney… https://www.rawpixel.com/image/9653512/photo-image-plant-tree-animalFree Image from public domain licenseThe Castalian spring at Delphi; the cavities in the rock are for votive offerings. Etching by F.R. Hay, 1813, after E.D.… https://www.rawpixel.com/image/13988885/image-plant-person-treeFree Image from public domain license