Nairobi National Park

Remarkably, the animals seem utterly unperturbed by it all. The park has acquired the nickname 'Kifaru Ark', a testament to its success as a rhinoceros (kifaru in Kiswahili) sanctuary. The park is home to the world's densest concentration of black rhinos (more than 50), though even the park's strong antipoaching measures couldn't prevent poachers from killing one of the rhinos in August 2013 and then again in January 2014. They were the first such attacks in six years, and reflect the current sky-high Asian black-market price for rhino horn. Lions and hyenas are also commonly sighted within the park; rangers at the entrance usually have updates on lion movements. You'll need a bit of patience and a lot of luck to spot the park's resident cheetahs and leopards. Other regularly spotted species include gazelles, warthogs, zebras, giraffes, ostriches and buffaloes. The park's wetland areas sustain approximately 400 bird species, which is more than in the whole of the UK.