Keeled Ratsnakes (Ptyas carinata), also known as the "King Ratsnake," are impressive and formidable reptiles native to Southeast Asia. These snakes are among the largest in their genus, with some individuals reaching lengths of up to 10 feet (3 meters). Their name "keeled" refers to the distinct ridges or keels on their scales, which give them a rough texture and a more rugged appearance compared to smoother-scaled snakes. This keeled texture is particularly noticeable on their dorsal scales, contributing to their distinctive look. Keeled Ratsnakes are known for their striking coloration, typically featuring a dark olive to dark gray/black body with lighter cream-colored undersides. The contrast between their dark and light scales, along with their sheer size, makes them a visually striking species.

In terms of behavior, Keeled Ratsnakes are highly active and agile hunters. They are primarily diurnal, meaning they are active during the day, and are often found in a variety of habitats, including forests, agricultural areas, and even near human settlements. Their diet is diverse, consisting of small mammals, birds, reptiles, and amphibians, which they capture using their impressive speed and strength. Keeled Ratsnakes are known for their defensive behavior when threatened; they may flatten their bodies, hiss loudly, and strike aggressively to deter potential predators. Despite their intimidating display, they are non-venomous and rely on their physical prowess to subdue prey and protect themselves. In captivity, they are considered intermediate to advanced species due to their large size, active nature, and specific husbandry needs, making them a fascinating yet challenging species for reptile enthusiasts.