We know Bear Grylls for climbing cliffs, parachuting from helicopters, balloons, and planes, paragliding, ice climbing, running through a forest fire, wading rapids, eating snakes, wrapping his urine-soaked t-shirt around his head to help stave off the desert heat, drinking urine saved in a rattlesnake skin, drinking fecal liquid from elephant dung, eating deer droppings, wrestling alligators, field dressing a camel carcass and drinking water from it, eating various "creepy crawlies" [insects], utilizing the corpse of a sheep as a sleeping bag and flotation device, free climbing waterfalls and
using a bird guano/water enema for hydration. Grylls also regales the viewer with tales of adventurers stranded or killed in the wilderness.
And we know Les Stroud because except for footage of him arriving at his new setting, and being retrieved at the end of the week, the content of each episode is taped entirely by Stroud himself using several DV cameras that he must carry with him everywhere that he goes (he later switched to a number of HDV cameras.) The burden of having to carry, place, and retrieve the camera equipment for each shot adds to the challenge and difficulty of each survival situation, and in several episodes Stroud chooses to leave a camera behind, videotaping him as he departs the area (the camera is retrieved later), and in one episode taking place in the Amazon, Stroud is forced to flee his camp and abandon all but two of his cameras due to fear of a stalking jaguar. His camera and audio gear typically weigh about 50 pounds (23 kg) in total. Here is a graph for a easy understatement of this 2.

