This screen cover sits atop a glass terrarium to provide a secure, ventilated roof for reptiles and other terrarium pets. A black steel frame supports a black wire mesh top that resists scratching and biting while allowing airflow through the enclosure. A hinged door is built into the mesh so keepers can reach in for feeding, misting, or spot cleaning without removing the entire cover or any mounted heat and light fixtures. The door closes with a simple turn-lock mechanism to keep it secured between uses. Both the frame and mesh are built to hold up under the heat generated by overhead bulbs and heating fixtures used in terrarium setups. The cover is intended to rest on top of a standard glass tank rather than attach permanently, and pairing it with separately sold screen clips adds extra hold-down security. No tools or assembly are required to place the cover on a terrarium.