The wildebeest face a more direct human threat too. Poachers kill some 20,000 of them each year, both to eat and to sell in bush meat markets. (Sinclair estimates that wildebeest meat feeds about one ...

(Sinclair estimates that wildebeest meat feeds about one million people.) But as the human population grows (at a hefty 4 percent annually in the towns along the Serengeti’s western border), the ...