Night on the ground on Skull Island is a dangerous time and place to be if you are small. Among the invertebrate predators, few had jaws that could compete with those of the Moonspider. A variety of Sunspider (actually called solifuge), not a true spider but still an arachnid, the ten-legged Moonspider sports huge crushing mandibles and paralytic venom to make short work of its prey. Rodents, lizards, ground birds, and even dinosaur chicks were potential victims. A bite from the sizable arachnid can cause significant discomfort to even an adult dinosaur. Moonspiders hunt at night to avoid becoming prey to diurnal birds and other large hunters.
A particularly nasty tactic developed by Moonspiders is to wait near dinosaur nests just as young are hatching. Tuned to pick up the faint scent of egg matter on a night breeze that might indicate the early stages of a hatching, Moonspiders are drawn to nests where young are still struggling to free themselves from their shells. In this vulnerable state they are easy prey for the invertebrate.