In the Parque Natural da Serra de São Mamede area, it is common to see wide dimension birds that feed on putrefied meat, contributing for the hygiene of the fields.
There, it is possible to find colonies of species such as the griffon vulture (Gyps Fulvus), the black vulture (Aegypius monachus) and, although less frequently, the egyptian vulture (Neophron percnopterus). Of the vulture family, the griffon vulture is the one most easily to find in the area. With a size range from one to three meters in wingspan and brownish plumage, the griffin lives in bands in which dozens of individuals can gather. These birds give an interesting show, as to gain altitude, they take advantage of the heat waves, gliding in circles, forming a giant “balloon”.