Out here, among the spent bullet shells and the freshly dug graves, the cost of protecting wildlife is painfully clear. As ivory poaching becomes more militarized, with rebel groups and even government armies slaughtering thousands of elephants across Africa to cash in on record-high ivory prices, a horrible mismatch is shaping up. Wildlife rangers — who tend to be older, maybe a bit slower and incredibly knowledgeable about their environment and the ways of animals, but less so about infantry tactics — are wading into the bush to confront hardened soldiers.

The outcome, too often, is not only firefights and battles, but also coldblooded murder, with dozens of African wildlife rangers killed in recent years, many in revenge-driven ambushes. Ivory poachers, it seems, are becoming increasingly wily and ruthless.

This summer, in the Democratic Republic of Congo, a militia of infamous elephant poachers sneaked up to the headquarters of a wildlife reserve and killed 5 people and 14 okapi, a rare animal with a giraffelike neck and zebralike legs. One guard who narrowly escaped said the attackers sliced open the chest of a downed colleague and ate his heart. In Zimbabwe, poachers are spreading deadly poisons on elephant carcasses to kill vultures. By taking out the birds that serve as a natural early warning system that a kill has been made, the poachers make it even more dangerous for rangers because they have no idea when the poachers are around. In Mozambique, the authorities said that poachers have recently begun using land mines.

Kenya, which is considered tame compared with some of these other places, has lost six rangers this year, more than in recent memory. One of them was Florence Hadia Abae, pregnant and the mother of a small boy. In March, she was following the footprints of suspected poachers near Tsavo National Park, a fabled tourist destination, when a poacher popped out of the bush and shot her in the face.

One of her colleagues was killed in the same ambush, shot in the leg, then finished off with a short, brutish stroke of an ax.