Guide to identify the most common birds of the Yucatan Peninsula. It is calculated that there are 546 species of birds in Yucatan, representing 75 families and divided into two general categories: resident birds, which reproduce and remain in the region throughout the year; and migratory birds, which only visit the region at certain times of the year. This guide includes 132 species, chosen from amongst the most common, and 14 of which are endemic, that is, found only in the Yucatan Peninsula. For ease of identification, they are divided into three groups: water birds, landbirds and passerines.