Dangerous not so much for the trees or the arch but for Jimmy. He didn't look concerned and glanced back to find all of his friends from the 12 different tribes save from harm on these unknown islands. At least he thought so. Indeed, there were a few dangerous creatures out there. It has been a computer entertainment enterprise.
Rumours have it that it's been the one for which the lemmings once worked so hard.
The one which made it possible for the lemmings to get much more skilled than in the early days. It was the one who taught them that specialization is useful and often necessary in a complex world. Now we know he's still alive but lost his bubblegum somewhere in the jungle. If this one tribe of lemmings will one again be keen enough and do what it once did so successfully is not known, and is rated as absolutely unlikely by world-famous lemming experts. I also misunderstood and blamed the Sony Corporation for the lack of further Lemmings Chronicles.