@csyampae I would have thought this in the world of C. gracilis if not for the lateral perforations of the thallus. Any thoughts? Under heath at 700m
Observation is for cause of beak deformation. More information on Alaska picornaviruses and occurrence in chickadees is available at the links in this observation: https://www.inaturalist.org/observations/164200324
Misc note: this bird allowed me to get extraordinarily close. The photos are uncropped using my phone.