A ramped platform device for a vivarium includes a first plate that has a fastener engaged to an upper for coupling to an upper rim of a wall of the vivarium, such as an aquarium or a terrarium. The first plate is in substantial abutment to an inner face of the wall. A platform is coupled to and extends substantially perpendicularly from a lower end of the first plate. A second plate that is coupled to and which extends transversely and downwardly from a perimeter of the platform allows an animal to climb up to and down from the platform.