Dirigible Tree

The dirigible tree split off from its ancestor the giant baloonarch. Some seed bubbles would get stuck up high in the rainforest canopy. There some adapted to live off the trees they would land on. Over time this parasitic sub-species developed into the mobile dirigible tree. It starts it life stuck high up in the canopy and grows larger and larger. Once it has grown larger enough and killed its host tree it will detach it roots and float to another tree to feed off of. Meanwhile it spreads more floating bubble seeds each time it has enough energy to spare to make them. Since they live in a rainforest there are many thunderstorms. These that are not firmly attaches can be blown down or even hit by lighting. Like their ancestors they are very resistant to fires however not all Dirigible Trees survive a lightning hit and will come crashing down in a hydrogen explosion thus cleaning the rainforest for new sapling of other trees to grow. Thus their epic deaths and constant killing of older trees keeps the forest ever changing and evolving. Without this tree the rainforest could become overgrown.