I thought they were Cycads at first (a class in gymnosperms). But these are angiosperms, apparently. Still look kind of similar to cycads, though, because of the clustered branches only at the apex.
Cool tree.
Cycads have palm-like leaves though, so veeery different! I'd say baobabs are not too different in their growth habit from other Bombacoideae (Malvaceae). Compare with e.g. Ceiba, Pseudobombax, Cavanillesia. And the leaves look just like most Malvaceae plants as well ;)
Fun fact: Pseudobombax trees can actually do photosynthesis with their trunk, which is green (or at least has green streaks).
but isn't that just the most efficient arrangement in a crowded forest where each tree elbows its neighbours out of the way for whatever sunlight they can get?
why waste energy in making branches and leaves low down when they'll forever be in the shade?
I think Baobab are evolved to survive wildfires and then spread seeds once everything around them is dead. perhaps the branches are only up high so they don't get caught by flames?
Even in baobab forest pictures they seem far enough apart for sunlight not to be an issue. I'd hazard either an environmental or animal caused adaptation (but I can't seem to find anything about why).
I'd also say for forests in general "crown shyness" means if they get similar enough height they usually avoid one another rather than compete.