To warm up, they often bask in the sun. Unlike most crocodiles, dwarf crocodiles only rarely bask in the sun. Himalayan vultures often bask in the sun on rocks. Captive specimens may bask in the sun with outstretched wings. All ages bask for warmth, often alongside other species of turtle. They are strong flyers and seek sunlit spots in which to bask. In cool temperatures and while pregnant, pit vipers also bask on sunny ledges. Some species will bask or perch on chosen perches. Also, crocodiles had never been seen on land to bask or breed. Younger turtles may bask on sedge and alder hummocks. Four species of crocodilians climb trees to bask in areas lacking a shoreline. Though they are not strong themselves, they bask in Kalia's strength. They will bask on logs and rocky outcrops. They also bask on top of aquatic vegetation. Male butterflies usually bask and feed until mid-day and then display territorial behaviour until roosting.