<Tr> <Th_colspan="2"> UNESCO World Heritage Site </Th> </Tr> <Tr> <Th> Type </Th> <Td> Natural </Td> </Tr> <Tr> <Th> Criteria </Th> <Td> vii, x </Td> </Tr> <Tr> <Th> Designated </Th> <Td> 1981 (5th session) </Td> </Tr>

How many animals are there in the serengeti national park