Turns out that Colin Trevorrow has been secretly shooting an eight-minute Jurassic World short film entitled Battle at Big Rock. Now, Trevorrow has revealed that the short film will feature two brand new species of dinosaur that fans have yet to encounter.

“There are two species we’ve never seen before," said Trevorrow. "The Nasutoceratops, which is a beautiful herbivore that feels like a Texas Longhorn. And the Allosaurus, one of the most iconic dinosaurs of all time. This one was a juvenile in the last movie. She’s all grown up now.”

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Battle at Big Rock takes place one year after the end of Jurassic World: Fallen Kingdom. The story follows a family on a camping trip to Big Rock National Park, which, according to Trevorrow, is about 20 miles from where the last film ended. Despite a few minor sightings, Battle at Big Rock will showcase the first major confrontation between dinosaurs and humans.

Trevorrow was able to shoot the movie in secret in Ireland last winter, adding: “I honestly never thought we’d make it this far without getting found out. The Irish can keep a secret.”

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The short stars André Holland, Natalie Martinez, Melody Hurd and Pierson Salvador, and was co-written by Emily Carmichael (Pacific Rim: Uprising). Battle at Big Rock will premiere on FX on Sunday, Sept. 15. For those without access to the channel, Trevorrow also explained that the short will be made available online immediately after it airs.

(via Collider)