Here's a video clip of Dr. Thomas Hildenbrandt at work. Thomas is part of the team working to save the Northern White Rhino, using similar techniques to those seen here with a male elephant.

There are only thirteen northern white rhinos left in the world. The species is hovering on the brink of extinction. But three men are pushing forward the frontiers of science to try to save them.

Thomas Hildebrandt and his team, from the Berlin Institute of Zoo and Wildlife Research, are world leaders in using artificial reproduction to breed rare elephants, rhinos and even komodo dragons.

Video is not for the faint of heart, so be warned...