Wetarex

Deinacrida rex or Weta-rex, related to the Wētā of distant New Zealand, are huge prehistoric crickets that vastly outsize their antipodean cousins. Appropriately dubbed "Weta-rexes", they are ferocious, pack-hunting predators that make their homes in the caves and chasms of Skull Island. Growing up to a meter long, they swarm in huge numbers, and can overwhelm/wear down any prey they come across. They are even capable of shredding the largest dinosaurs to pieces with their shearing mouths.