The South Forest zoo opened three months after Israel tightened its blockade of Gaza in 2007. Most of the zoo’s creatures – which range from hyenas to wolves, ostriches and chimpanzees – came through the tunnels with Egypt, but all is not as it first seems. Zookeeper Mohamed Owida explains how he has been forced to resort to taxidermy to preserve his lion and tigress, apparently killed by white phosphorus in an Israeli attack