The aid workers risk their lives daily to try to save people, putting up with janjaweed, scorpions, camel spiders and pit toilets inhabited by bats.
The lightness and speed of its movements told him that this was a solifugid, or camel spider.
The camel spider is the greediest of creatures; it will eat until its stomach is so distended that it can hardly move.
Images of camel spiders could give the impression that this could be mistaken for a giant ant, but certainly not the size of a fox.
The camel spiders now freely hunt for prey, unafraid of any predator - including man.
They are known variously as camel spiders, wind scorpions, sun spiders or solifuges.
In recent years, Hollywood has learned that people like watching others chow down on calf pancreas and camel spiders.
U.S. soldiers have taken pictures of the camel spider and put them on the net.
Niall sensed about them that same indifferent friendliness he had perceived in the camel spiders of the desert.
Slightly more believable was the 2004 hoax involving "giant camel spiders" in Iraq.