'Strayan trees, so they are trying to kill people.
They look like gum trees to me, it’s not unusual for them to fell with no warning. Eucalypts will save water during drought conditions by drying out, leading to them dropping heavy branches, even in still conditions.
If that particular stretch of soil had better drainage or poorer soil. it could be those trees are weak enough to fall like that while other are stronger.
Never camp under a gum tree. Some species are locally known as “widowmakers” for this reason.
