One other thing I should add:

So often in biology there is a "wink-wink" short-hand used where it is said that a species "needs" or "wants" to evolve into such & such.

There are better examples of this but I'm just too tired to think of them.

It's quite easy to slip into that mode of thinking while writing and I tried to excise that kind of verbiage above - maybe not always successfully.

But, to be clear, there is no conscious forethought or master plan or desire or anything of that nature with respect to natural selection / evolution.

RBG