What you want to do is tame a male and a female (high levels of course) then have them mass produce. When you have about 10-15 set pump them all into melee and stam and have them wander around the base. And have then on nuetral. So that way the next person to raid you will crash once all of the velonsaurs start shooting
A must-have for new extinction players! Makes quick work of Defense Units and Enforcers even at lower levels. Very useful in base defense and scouting missions as they run forever and are only a bit slower than raptors.