Tui De Roy / Feral Goat (Capra hircus) herd, new invasion causing rapid desertification of last Giant Galapagos Tortoise stronghold, Alcedo Volcano, Isabella Island, Galapagos Islands, Ecuador

Sebastian Kennerknecht / Dromedary (Camelus dromedarius) camel browsing on Acacia (Acacia sp) tree, reducing food for native herbivores, Hawf Protected Area, Yemen

Sebastian Kennerknecht / Dromedary (Camelus dromedarius) sub-adult browsing in cloud forest which reduces food for native herbivores, Hawf Protected Area, Yemen

Sebastian Kennerknecht / Dromedary (Camelus dromedarius) in cloud forest, their browsing reduces food for native herbivores, Hawf Protected Area, Yemen

Colin Monteath / Domestic Sheep (Ovis aries) and Domestic Goat (Capra hircus) with shepherd out to pick up newborns and keep them warm in ger, northern Mongolia

Colin Monteath / Domestic Sheep (Ovis aries) and Domestic Goat (Capra hircus) group grazing in winter, Gobi Desert, Mongolia

Albert Lleal / Baobab (Adansonia sp) tree and goats on overgrazed land, Burkina Faso, west Africa

Gerry Ellis / Fence separating an over-grazed pasture from native Chihuahuan Desert grassland, near Hatch, New Mexico

Gerry Ellis / Fence separating over-grazed pasture from native Chihuahuan Desert grassland near Hatch, New Mexico

Daniel Gomez / Aerial view of settler's outpost with surrounding area overgrazed by cattle and goats. Dry Chaco, Argentina. almost 80% of Dry Chaco is affected by overgrazing altering its structure and species compo...

Sebastian Kennerknecht / Dromedary (Camelus dromedarius) camel sub-adult in overgrazed cloud forest, Hawf Protected Area, Yemen

Sebastian Kennerknecht / Domestic Sheep (Ovis aries) flock grazing near bedouin camp, Hawf Protected Area, Yemen

Sebastian Kennerknecht / Dromedary (Camelus dromedarius) camel browsing on Acacia (Acacia sp) bush, reducing food for native herbivores, Hawf Protected Area, Yemen

Sebastian Kennerknecht / Domestic Cattle (Bos taurus) herd in overgrazed area of cloud forest with Bedouin camp in the background, Hawf Protected Area, Yemen

Colin Monteath / Domestic Sheep (Ovis aries) and Domestic Goat (Capra hircus) group grazing in winter, Gobi Desert, Mongolia

Tui De Roy / Feral Donkey (Equus asinus) pair in overgrazed pasture, San Benito Island, Baja California, Mexico

Tui De Roy / Feral Donkey (Equus asinus) pair on overgrazed pasture, San Benito Island, Baja California, Mexico