Bob Irwin, enough said.

"If the shooters knew anything about how nature works, they'd know the really big boys keep everything in check," he said. "You shoot out the big males and the teenagers will start running around testing their skills.

"If you get young ones running riot, it's going to introduce a little more risk to everything as far as humans are concerned.""

The younger one's run around anyway trying to knock off the big one's, or at least the food - until the big one comes along. And then if the younger one has the balls, a fight might ensue.