How about the way they killed their prey in the film?

One question is how did these people kill their enormous prey?

They use this to kill prey, and to defend themselves.

They can often kill their prey in one powerful bite.

They kill their prey immediately, or shortly after the attack.

They are able to successfully kill prey twice their own size.

They prefer to kill their prey with a single bite to the back of the neck.

The mantis is able to kill prey several times larger than itself.

They are predators which kill their prey by hitting them at high speed.

They kill their prey, and it turns into a cave painting, upon which a building begins to be built.