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Yvonne de Jong & Thomas Butynski

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Yvonne A. de Jong (PhD) is a Kenya-based Dutch primatologist who has worked in Africa for more than 10 years. She is the co-leader of the Eastern Africa Primate Diversity and Conservation Program, the Afro-tropical Regional Coordinator of the IUCN/SSC Wild Pig Specialist Group, member of the Nocturnal Primate Research Group at Oxford Brookes University, and Collaborating Scientist of the Institute of Primate Research in Nairobi. Her main research focus is the biogeography, diversity and conservation of eastern Africa's primates and several other groups of large mammals, including the warthogs.

Thomas M. Butynski (PhD) is a conservationist and ecologist who has worked in Africa for 35 years, mostly in Botswana, Kenya, Uganda and Equatorial Guinea. He is a member of four IUCN/SSC Specialist Groups (Primates, Antelopes, Afrotheria, Wild Pigs) and has served as Director of the Institute of Tropical Forest Conservation in Uganda, Director of Conservation International’s Eastern Africa Biodiversity Hotspots Program, Vice-Chair of the Africa Section of the IUCN/SSC Primate Specialist Group, Senior Editor of the journal, African Primates, Editor for Mammals of Africa, and as co-leader of the Eastern Africa Primate Diversity and Conservation Program. He now works for the Zoological Society of London as Director of the King Khalid Wildlife Research Centre in Saudi Arabia.

Photos: Biodiversity of Northern Kenya´s Huri Hills and Mount Forole

Yvonne de Jong and Tom Butynski are National Geographic grantees working to track down what may be Africa’s least understood large animal, the Desert Warthog.

The Creatures of Kenya’s Forgotten Loima Hills

Yvonne de Jong and Thomas Butynski are National Geographic grantees working to track down what may be Africa’s least understood large animal, the desert warthog

Kenya’s Elusive Patas Monkeys

Yvonne de Jong and Thomas Butynski are National Geographic grantees working to track down what may be Africa’s least understood large animal, the Desert Warthog.

Secret to Olive Baboon Survival in a Barren Desert

During a survey of warthogs in northern Kenya, National Geographic grantees Yvonne de Jong and Tom Butynski encounter olive baboons in the very dry region east of Lake Turkana.

Close Encounter with a Desert Roaming Cheetah

The population size and geographical range of the cheetah have declined dramatically during the past 50 years . During a survey of warthogs in Northern Kenya, National Geographic grantees, Yvonne de Jong and Tom Butynski, came eye to eye with this large charismatic cat in the Chalbi Desert, 65 km north of their known current range.

New Population of Bushbabies Discovered in Northern Kenya

The Somali lesser galago is Kenya’s least known primate. Since 2003, Tom Butynski and Yvonne de Jong have been gathering information on the natural history of this galago. During their warthog surveys in northern Kenya a new population of Somali lesser galagos was discovered at an oasis in the Chalbi Desert.

Where Warthogs Roam at Night….

Kenya’s common warthog, thought to only be active during the day, appears to have ‘swapped’ its strictly diurnal lifestyle for a nocturnal one. In the desert environment of central northern Kenya, food is scarce and there is no drinking water for several months at a time.

Quest for Kenya´s Desert Warthog

Yvonne de Jong and her team are in search of the desert warthog and common warthog- yes, the lovable ‘Pumba’ from the ‘Lion King’- in northern Kenya.