ave dried up, they seek out barrel cactus, chain fruit cholla fruits, and other cactus fruits for their water content. They avoid the sun by resting in the shade or in caves and shallow overhangs, but they can withstand body temperatures of up to 107°F (42°C)! (Normal body temperature for bighorn sheep is 101 to 102°F; 38 to 39°C.) Enlarged stomach compartments can store water to last for several days, allowing the sheep to go two or three days without a drink. They can then drink up to 20 percent of their body weight (up to 2 gallons; 7.5 liters) in just a few minutes at a waterhole.