User blog comment:Jacobaaronlaverick/Releasing Dinosaurs into the Outside World./@comment-17754282-20150302002656

It probably wouldn't work out.

A common misconception is that human damage to the environment and ecosystems is done through only pollution, deforestation and construction. In fact one of the worst mistakes that humans frequently make is "introducing" an animal into another environment, be it Burmese Pythons in the Florida Everglades, American Grey Squirrels to British woodlands or cows, horses,sheep, goats, camels, cane toads, foxes and rats to Australia - there are literally dozens of examples of both intentional and accidental releases of animals into non-native habitats and the results are usually one of two - either the introduced animal struggles for a few months/years/decades before ultimayely dying out or they become successful and have a devastating effect on local wildlife.

As such many countries, Australia in particular, spend a good deal of resources not only controlling existing cases of invasive species but also preventing further cases from happening. Assuming that there were places on earth today where prehistoric animals could survive, you most likely wouldnt be allowed to do it