Some pioneers took eggs and butter packed in barrels of flour, and some took dairy cows along the trail. Hunting provided another source of food along the trail; pioneers hunted American bison as well as pronghorn antelope, deer, bighorn sheep, and wildfowl. From rivers and lakes, emigrants also fished for catfish and trout. When emigrants faced starvation, they would sometimes slaughter their animals (horses, mules, and oxen). In desperate times, migrants would search for less-popular sources of food, including coyote, fox, jackrabbit, marmot, prairie dog, and rattlesnake (nicknamed "bush fish" in the later period).