Northern white rhinoceros
Several species of rhinoceros are critically endangered, but none is on its last legs like the northern white. These magnificent beasts once roamed vast territories in sub-Saharan Africa, but their numbers have rapidly declined over the last century, mostly due to poaching.
Their population in the wild was reduced from 500 in the 1970s down to just four by the mid 2000s. Unfortunately, not even these last four could find protection; they have vanished and it is believed poachers got to them as well.
This means that the only northern white rhinos still alive are the three held in captivity. They belong to the Dvůr Králové Zoo in the Czech Republic but they reside at the Ol Pejeta Conservancy in Kenya, where they are watched by armed guards 24/7. The three rhinos are part of a captive breeding program — a last-ditch effort to revive the species.