Your park needs to be in constant evolution if you want to keep your business growing. That is why you need to send expedition teams regularly to capture new and bigger specimens (check the habitats' research section to know how to catch bigger dinos!). 

Your Dino Depot will host and keep safe all your captures, independently of their size or monetary value. But you will always choose which dinosaurs should live in the habitats. Tap on the specific enclosure to check which dinos are currently living there, and select those dinosaurs you want to change for others that are more profitable.

If you see an exclamation mark over one of your beloved creatures, you definitely need to send it back to the Dino Depot and change it for another that provides more income per client! Remember that you can release those dinosaurs that won't be profitable anymore for an extra amount of money.