My Czech isn't all it could be but unless I'm missing something it is literally 'spot the afrotherian' - the sign is outside the elephant house and is to guess what of these are the closest relatives of the big grey ones.
Living relatives
Elephants belong into the order Proboscidea, that comprises two species - an african elephant and an asian elephant. The appearance of those two biggest land mammals differs from all other animals, yet they have two living close relatives. Can you guess which ones?