An anus that comes AND goes? So far we have only had vocal advocates of the former in this forum, I await further developments with bated breath.
Biologically speaking, I'm surprised that the scientists are surprised, how else could an anus develop other than via an amoebous digestive surrounding morphing into a gastrointestinal tract which needs a more stable, permanent, yet sealable exit?
Alas!, I always thought it was a bad idea that the US of A did not teach its children proper evolution.
We need some Creationists here to liven things up!