Proyecto AVIS1 is an open access citizen science database that stores information collected by amateur ornithologists about bird occurrences and abundance in Spain. Proyecto AVIS was launched in 2005 and today stores data from 415 species (ca. 90% of bird species in Spain); it covers 30% of the Spanish territory, including the Canary Islands in the Atlantic Ocean and the Balearic Islands in the Mediterranean Sea. Here, we acknowledge the work of all the volunteers that have gathered bird records in the field and uploaded these observations over the last 10 years, and introduce Proyecto AVIS to a broader community of biogeographers and macroecologists to promote its use for research. 
