User blog comment:Lord Loss/Monster Hunter Theory... Blog/@comment-2194133-20110712201834/@comment-1011548-20110713070645

Thunder Gigginox is weird. It may well be an actual subspecies - one that split off relatively recently (in evolutionary terms) from the main species after a lucky mutation that resulted in it being able to spit balls of mucus with an electrical charge. And, erm, have a different colour. Quite a big mutation then. I would say that Thunder is a big advantage in the Tundra, but I can only think of Tigrex that's weak to it... and you can avoid him easily enough by sticking to the ceiling.

The flavour text says Gigginox is 'highly fertile' - perhaps the sub is much less fertile and lays eggs rarely; so rarely we don't see it. Or something.