All the dinosaurs captured will live safe in the Dino Depot. Visit this building from time to time, and remember to manage which specimens will be set in a specific habitat and which ones should be released back to the wilderness. 

 

You can tap on the barn icon (lower-right part of the screen) or right on the building to open your dino-list. Choose those dinos that won't be profitable anymore and tap on the FREE button to release them, or GO TO ITS HABITAT if you need to compare stats with other creatures. Remember to send expeditions to fill the empty spots!