Originally posted by Scorpio71GR Due to the orange plumage these two are immature cranes.
The bare, red skin on the forehead indicates that they are adults. The adult plumage becomes stained adventitiously to a rust colour over the course of the year between the annual moults, so that by summer they are quite rusty-coloured.
(Gerber, Brian D., James F. Dwyer, Stephen A. Nesbitt, Rod C. Drewien, Carol D. Littlefield, Thomas C. Tacha and Paul A. Vohs. 2014. Sandhill Crane (Grus canadensis), The Birds of North America Online (A. Poole, Ed.). Ithaca: Cornell Lab of Ornithology; Retrieved from the Birds of North America Online: bna.birds.cornell.edu.bnaproxy.birds.cornell.edu/bna/species/031. doi:10.2173/bna.31)