Using them against your enemy of course. If they don't have a nest, you can lead them clear into the enemy base as a form of suicide mob. Scout destroys nest, scout runs to the enemy base with pack of allosaurus. Scout dies. Enemy attack allosaurs like noobs. Allosaurs proceed to raise cain on enemy base.
Get two mortars and a monk on a salta, then destroy the nest and start running, the monk will heal the salta while it's running. When the salta arrives, use the invincibility while some workers close the enemy base with some skewers (with a gate of course). The salta gets out while the enemy is living under hell with allos.