bamboo and moorland, with small areas of forest. By contrast, Akagera has a savanna ecosystem in which acacia dominates the flora. There are several rare or endangered plant species in Akagera, including Markhamia lutea and Eulophia guineensis. The greatest diversity of large mammals is found in the three national parks, which are designated conservation areas. Akagera contains typical savanna animals such as giraffes and elephants, while Volcanoes is home to an estimated one-third of the worldwide mountain gorilla population. Nyungwe Forest boasts thirteen primate species including common chimpanzees and Ruwenzori colobus arboreal monkeys; the Ruwenzori colobus move in groups of up to 400 individuals, the largest troop size of any primate in Africa. Rwanda's population of lions was destroyed in the aftermath of the genocide of 1994, as national parks were turned into camps for displaced people and the remaining animals were poisoned by cattle herders. In June 2015, two South African parks donated seven lions to Akagera National Park, reestablishing a lion population in Rwanda. The lions were held initially in a fenced-off area of the park, and then collared and released into the wild a month later. Eighteen endangered black rhinos were brought to Rwanda in 2017 from South Africa. The animals adapted very well so in 2019, five more black rhinos were delivered to Akagera National Park from zoos all over Europe. Similarly, the white rhino population is growing in Rwanda. In 2021, Rwanda received 30 white rhinos from South Africa with the goal of Akagera being a safe breeding ground for the near-threatened species. There are 670 bird species in Rwanda, with variation between the east and the west. Nyungwe Forest, in the west, has 280 recorded species, of which 26 are endemic to the Albertine Rift; endemic species include the Rwenzori turaco and handsome spurfowl. Eastern Rwanda, by contrast, features savanna birds such as the black-headed gonolek and those associated with swamps and lakes, including storks and cranes. Recent entomological work in the country has revealed a rich diversity of praying mantises, including a new species Dystacta tigrifrutex, dubbed the "bush tiger mantis". Rwanda contains three terrestrial ecoregions: Albertine Rift montane forests, Victoria Basin forest-savanna mosaic, and Ruwenzori-Virunga montane moorlands. The country had a 2019 Forest Landscape Integrity Index mean score of 3.85/10, ranking it 139th globally out of 172 countries. Economy Rwanda's economy suffered heavily during the 1994 genocide, with widespread loss of life,