TRABALON F. & JAIS M. 2021. Field identification of the Golden Eagle, and the different plumages of the ssp. homeyeri […]
OLLÉ A. MONTRÀS-JANER T. & GOY J. 2020. Identification of juvenile Lesser Kestrel: keys to differentiate from juvenile Common Kestrel. […]
snake eagle
OLLÉ A. &  MONTRÀS-JANER T. 2020. Identification of second and third plumages in Short-toed Snake Eagle. Short-toed Snake Eagle […]
OLLÉ A. &  MONTRÀS-JANER T. 2020. How to sex Eurasian Hobby in juvenile and transitional plumage. Adult birds are […]