It is interesting to see but she was probably aborting the babies because of the stress. It was likely a last ditch effort to save the next generation.........
It's sad that the mother will likely die due to the trauma.
What I find different about the birth is that they all came out tail first. It's odd because I thought their spine would puncture the mother on the way out but it's obvious that none did.
Well that makes sence.I think I saw on the Discovery channel somewhere that the barb on the tail doesn't harden until it's out of the mother.
Quick google gave me a site http://www.maxsidorov.com/family/stingrays.html
near the bottom
" The baby rays are born tail first, with their wings rolled up. Their poison spine is rubbery and has a protective covering so that the mother is not stung while giving birth. Within a few days, the ray's spine hardens."