The film contains multiple violent sequences, in which a family defends itself against alien creatures. They use firearms, fire and traps to kill the creatures. Some injuries and blood is depicted.
Some scenes show decaying bodies and skeletons.
The beginning scene can be intense for some viewers. Many people get attacked, but most of it is offscreen. There is a bit of blood actually shown in the film, but the tone is still very dark.
When the monsters open up their "face plates", they're usually killed with a shot to the head. Minimal gore is shown flying, and at one point, a character sticks an iron rod into a monster's head with dark colored blood spewing.
When the monsters attack, there is usually very little blood. It's almost always just a simple swing of their claws that kills people and it's obscured most of the time.
There are several bloody footprints throughout the movie.
One of the monsters gets shot in the head with a shotgun. Lots of blood spurts out of its head along with a few chunks of its face are blown off.
A monster gets a chunk of its face blown off with a shotgun. It is then shot in the back of the head with a rifle. This isnt that graphic though since its only a monster.
A scene involving a bear trap is pretty gruesome for a PG-13 however it isn't lingered on at all. Only mild blood shown.
A man is stabbed bloodlessly in the thigh.