These are southern red oak, or Spanish oaks. They do grow straight where there is soil, but there is almost no soil here, only rough limestone rock formations and caliche layers. The rocky terrain, together with sapling damage from animals and weather, makes them crow crooked and deformed. The leaves which turned bright red in November are brown and a few still hang on the trees, but the green has been gone since October, a normal thing for here. This tree has some long-dead, brown leaves on it still, but just this one random green sprig poking out is weird, never seen anything like it before.