Data Sources

Scientific Paper
Harris, G., Thirgood, S., Hopcraft, J., Cromsigt, J., Berger, J., "Global decline in aggregated migrations of large terrestrial mammals." Endangered Species Research (April 21, 2009).
Images

Africa, May 2004 (Blue Marble: Next Generation; satellite: NASA Terra/Aqua, sensor: MODIS)

Southern Africa park boundaries data, 2005 (World Database on Protected Areas)

Migration data, 2009 (Harris et al. 2009)

Bison (Jack Dykinga, USDA)

Pronghorn (Outrigger)

Blue wildebeest, springbok, Burchell's zebra, and blesbok (Rudi van Aarde)

Kulan, saiga, and wildebeest in Central Kalahari (Richard Reading)

Pronghorn migration (Joel Berger, WCS)