Leave the World Behind has left Netflix viewers with a lot of questions, but one of the biggest ones centres on its weird, creepy deer.

During the apocalyptic thriller, deer keep appearing at the house and its surroundings. They never do anything, although when there are dozens of them around Amanda and Ruth, they certainly don't look friendly.

As with Leave the World Behind's other mysteries, there's not a reason given for the deer in the movie.

However, director Sam Esmail has explained why deer were chosen – and it's not just because they're in the book.

mahershela ali, myhala herrold, julia roberts, ethan hawke in netflix's leave the world behind
Netflix

Related: Sam Esmail knows Leave the World Behind might split audiences

Esmail told Netflix's Tudum: "Deer are peaceful creatures. To turn that sweet image into now this sort of ominous, menacing, almost warning – I thought was really interesting.

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"That's the trick about this movie. We always tried to take the things that we never really considered a threat and then turn it around on them."

So there you have it, there's no particular reason why the deer are acting so strangely, but Esmail just knew it would freak audiences out and he was absolutely right.

Unsurprisingly, the film didn't use any real deer, but CGI ones.

mahershala ali, julia roberts, leave the world behind
Netflix

Related: Leave the World Behind star Myha'la explains "genius" change from the book

Esmail added: "It's a testament to Chris Harvey, my VFX supervisor; Dione [Wood], my VFX producer; and Alec [Hart], who's on the VFX team.

"They knew that we wanted to make the deer feel as real as possible, and they were on set. We had mock-ups there so that the actors had something to play off of, and we made sure that the lighting on the fur [was] as accurate as possible."

Leave the World Behind is available to watch on Netflix now.

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Joe Anderton is a freelance news writer at Digital Spy, having worked there since 2016. In his time, he's covered a host of live events and interviewed celebrities big and small. A big fan of TV and movies both mainstream and obscure, Joe also enjoys video games and in particular PlayStation. Joe currently does not use Twitter, but he only ever used it to tell people to watch the film Help! I'm a Fish.