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A successful move of 21 eastern black rhinos (犀牛) to a new home of a grassy plateau that hasn’t seen them in decades will give them space to live and help increase the population of the critically endangered animals. It was Kenya’s biggest rhino relocation ever.

The rhinos were taken from three parks that are becoming overcrowded to the private Loisaba Conservancy, where rhinos were wiped out by poaching (偷猎) decades ago.

The 18-day exercise involved tracking the rhinos using a helicopter and then shooting them with tranquilizer darts(麻醉飞镖). Then the animals—which weigh about a ton each—have to be loaded into the back of a truck for the move. Disaster nearly struck early in the relocation effort, when a tranquilized rhino fell into a river. Workers held the rhino’s head above water with a rope to stop it from drowning while the tranquilizer drug took effect, and then the rhino was freed.

Some of the rhinos were transferred from Nairobi National Park and made a 300-kilometer trip. Others came from two parks closer to Loisaba.

Rhinos are generally animals enjoying being alone and are at their happiest in large living areas. As numbers in the three parks where the rhinos were moved from have increased, wildlife officials decided to relocate some in the hope that they will be happier and more likely to increase. David Ndere, an expert on rhinos at the Kenya Wildlife Service, said their reproduction rates decrease when there are too many in a territory.

Kenya has had relative success in recovering its black rhino population, which dipped from around 20, 000 in the 1970s to below 300 in the mid-1980s because of hunting, according to conservationists, raising fears that the animals might be wiped out completely in the country. Kenya now has around 1, 000 black rhinos, the third biggest population behind South Africa and Namibia. There are just over 6, 400 wild black rhinos left in the world, all of them in Africa, according to the Save the Rhino organization.