If you face an emergency, you’re likely going to need to tranquilize and put your dinosaurs to sleep in Jurassic World Evolution. The most common scenario where you need to do this is if one of your animals escapes and is causing havoc in the park.
During the tutorial on the first island in the game, you are actually required to allow one of the dinosaurs to escape in order to test the security at your park. You will need to tranquilize the escaped dinosaur, then transfer it back to it’s cage.
Below, you will find our guide for tranqulizing dinosaurs and putting them to sleep. If you want to check out some more Jurassic World Evolution guides, we have you covered!
How to Tranquilize
Once a dinosaur has escaped, you need to resolve the situation quickly. You should have already built the ACU Building, which is a security building. You build this during the tutorial, before your first dinosaur escapes.
When a dinosaur has escaped, select the helicopter on the building and choose ‘Add new task’. It should default to tranquilize, however you may need to choose it yourself.

With the indicator that shows up on the screen, find your dinosaur and ensure the marker is over it before confirming. It should be similar to the image above, you can see that the Tranquilize dinosaur option is available.

The helicopter will take off and your security team will attempt to tranquilize the escaped dinosaur. Once they have done so, you can then transport the dinosaur back into it’s cage.
This process might be slow at first, as the ACU team can miss some of the shots. You can use the research building to improve the ACU team later on.