One place where spiky cacti of great size grow together is almost impossible to walk through. These areas, known as tunales, not only prevent bare-chested Indians from entering, but also anyone fully dressed. During our solitary walks we tried several times to penetrate the tunal that crowns the hill with the fort, along which runs a path. There we found thousands of examples of this strange plant. At times nightfall surprised us as there is no twilight. Then this place becomes dangerous, for the rattlesnake (Crotalus cumanensis), the coral and other poisonous snakes seek out these hot places to deposit their eggs in the sand.