The Forsten’s cat snake (Boiga forsteni) is an arboreal and nocturnal species found in the lowland wet, intermediate, and dry zones of Sri Lanka. There are multiple distinct colour varieties, with the most common being dark grey with black and white crossbars and a white belly. These snakes have large fangs and are mildly venomous, with bites causing swelling and pain. They inhabit forested areas, agricultural fields, and home gardens, sometimes entering houses. During the day, they hide in tree hollows or crevices, emerging at night to hunt. When threatened, they raise their bodies into loops, shake their tail tip, and may hiss or attempt to bite. Their diet includes lizards, birds, bird eggs, small mammals, and occasionally other snakes, which they may constrict before consuming. Forsten’s cat snakes are an oviparous species, laying 5 to 15 eggs in tree holes during the breeding season.