gralha-de-bico-amarelo vs gralha-de-nuca-cinzenta

The Alpine Chough and Eurasian Jackdaw can be distinguished by their bill and plumage. The Alpine Chough has a slender, yellow bill, while the Eurasian Jackdaw features a thicker, black bill. In terms of plumage, the Alpine Chough is uniformly black, whereas the Eurasian Jackdaw has a greyish nape and sides of the neck.

Look for the bill color: yellow in Alpine Chough and black in Eurasian Jackdaw. Check the plumage: Alpine Chough is all black, while Eurasian Jackdaw has a grey nape.

The Alpine Chough is uniformly black, whereas the Eurasian Jackdaw has a distinctive greyish nape and sides of the neck.