Horse Point Plain is the only place from which live specimens of the critically endangered, possibly extinct, invertebrates Labidura herculeana and Aplothorax burchelli have been recorded.

The Saint Helena earwig (Labidura herculeana) is a species of earwig endemic to the isolated island of Saint Helena, in the south Atlantic Ocean.

As all known hoopoes are insectivores that feed primarily on large insects, the Giant Hoopoe may have been a predator of the Saint Helena Giant Earwig (Labidura herculeana), an insect which has not been seen alive since 1967.