are Splits ‘square’ hips possible?

I’ve never seen an athlete who can do splits on floor with hips parallel.

BUT Rhythmic and contortionists do seem to be able to to get into positions that seem anatomically impossible.

"I actually don't think it's anatomically possible to do full square splits, based shape of the hip joint and ligaments."https://t.co/dnpNfBaDSI pic.twitter.com/FBB0TMBei8

— SHIFT MvmtScience (@SHIFT_MvmtSci) December 18, 2021