Australian: IF you look at a map of southeast NSW where grazier John Alcock and his children run three properties on the edge of the Snowy Mountains, you’ll see that national parks and state forests cover at least the same area as private grazing country. Out of the national parks come mobs of kangaroos that know their way into Alcock’s drought-hit land when he plants improved pasture and fodder crops for cattle and fine-wool Merinos. “Good heavens, if we sow something, they just invade …