Shadow Gorilla is a legendary pet that was available from Solomon's General Store for 1500 RuneCoins (1350 for members) until the beginning of 28 February 2017. A Shadow Gorilla has three stages of growth - baby, adolescent, and adult. It takes roughly 15 hours for a Shadow Gorilla baby to grow into an adolescent Shadow Gorilla when following the player, though this can be sped up by interacting with the pet. Stages can be skipped by using a Growth Surge on the pet, e.g. baby to adolescent or adolescent to adult. There are no recolour options for the Shadow Gorilla.