Olga Chekanova, 24, went from nightclub at 4am, and taxi driver dropped her 200 metres from destination.
A deal was signed giving South Korean scientists exclusive rights on cloning the woolly mammoth from tissue samples found recently in the Siberian permafrost.
Yury Obraztsov, 54, was beaten, whipped and fed on animal food for 3 years after going missing in 2014.
But seals prove more adept at undertaking polar missions, including potentially killing intruders, say experts.