Skullcrawlers

The Skullcrawlers are the secondary antagonists in the 2017 adventure film Kong: Skull Island. They are monster who lives in the Island and they are lead by the Alfa Skullcrawler 

Knowing the Threat
After the Sky Devils Team incident with Kong, Conrad and the survivors are in an old structure which is under the control of an ancient community, there they meet Marlow who tells them that it is not with whom one should fear but a few Creatures called Skullcrawlers, are responsible for the death of his partner and are looking to feed

Jack Chapman who was one of Sky Devils' commandates is killed by one of them while he was distracted

The battle in the Death Valley
When Conrad and Skydevils arrive, they encounter one of the Skullcrawlers who murder Randa and several members of Sky Devils, during the battle it is revealed that he is the one who killed Chapman, and 2 members of the survivors are in an exposed place And Conrad runs to save them in an attempt to kill them, San with a lighter manages to kill him