More reptile and small animal fans choose Zilla Critter Cage terrariums, thanks to the sliding top screen for added strength, ease of access and improved safety. Zilla Critter Cages feature an escape-resistant mesh top that opens and closes with a smooth slide and can be locked for added security. Pet comfort and health is assured by a recessed hanging space for water bottles, plus wiring ports to neatly channel heater cords.