i thought i'd start something like this, although i make no promises that it will continue every day. anyway, here it is : in certain pine trees, like the monterey pine, the pine cones are closed up by an pitch-like substance (they are called serotinous cones). they only pop open when a forest fire occurs, which incidentally will kill the parent tree. in other words, the only way these trees reproduce is if a fire kills the parent tree. these are called "fire climax trees".