That tree looks normal. I think I saw it on The Lion King. Well, it is from the African savannah. It is also a mass murderer. Van Hoven made his discovery when asked to investigate the sudden death of some 3000 South African antelope, called kudu, on game ranches in the Transvaal. He noticed that giraffe, roaming freely, browsed only on one acacia tree in ten, avoiding those trees which were downwind. Source. The tree, when it is being eaten, gives off ethylene which can be detected by other Acacia trees up to 50 yards downwind. Those trees in turn produce enough toxin to kill an animal, say a kudu. That means the first bite of these trees, rather than making the kudu sick and stop eating, kills it. Oh, and they have an army of ant bodyguards. The trees provide housing and nectar for the ant, and the biting ants attack whatever comes near the tree. The plant does need herbivores to help spread its young, however, so thus there is one of the most complicated three-way relationships in history.