sentences:  Other considerable heights, as well as being famous, are the Bola del Mundo ("Ball of the World") in Navacerrada, at a height of 2,258 m, the Siete Picos ("Seven Peaks") in Cercedilla, at 2,138 m, and the Peña Cebollera (2,129 m) at the northernmost end of the province, a tripoint between the Madrid region and the provinces of Segovia and Guadalajara.Among the protected species of birds nesting in the region stand out the Spanish imperial eagle, the golden eagle, the Bonelli's eagle, the cinereous vulture, the peregrine falcon and the black stork.Exotic invasive species of birds and mammals in the region include the red-eared slider, the monk parakeet, the common snapping turtle, the rose-ringed parakeet, the American mink and the raccoon.