 Starting with upgrades to the wolf facilities in 2004, which allowed the wolves overnight access to the outside enclosure they share with the parks North American black bears, the park had spent about £4 million by 2010 to upgrade off-show animal facilities in the park.The African Ungulate Conservation Centre (or "Antelope House") was built in 2007 to help conservation efforts with hoofed mammals.The Asian Elephant Conservation Centre, built to house the parks' Asian elephants, opened in 2008.