Zeppelin Tree

The zeppelin tree split from the sky tree. It has a balloon shape much like a human airship (with mutations leading to double trunks and double balloon envelopes playing some part to its development), which lets it support more trunk, move through the air faster and, most importantly, be a harder shape to swallow. It has also increased in size, and has developed a light, firm structure on the inside of the balloon to help it support itself. Most plentwhales will often avoid them and will totally ignore the larger specimens, as it is difficult to eat them now they are bigger and have nasty shapes. This edge has let it be more successful than its ancestor, but not so much to make the sky tree extinct, which can actually do quite well to fly close to its daughter species for protection. The zeppelin tree touches down to the surface of bodies of water to get resources the same way the sky tree does, and similarly, plentutri nest on them.