Bison defends dead calf from wolf pack

Outside Lamar Valley in Yellowstone National Park, this devoted mother was spotted in the early morning defending her deceased calf from a wolf pack. She spent the entire day defending her lost offspring, with only brief help from a few bull bison. After an all-day ordeal, including an onslaught from a coyote pack whose den was within 100 yards of the fallen baby, the mother let her child go and left to graze, drink, and rejoin the herd. She is the bravest animal we have ever witnessed. Yellowstone Live was on scene and briefly featured her during this summer's broadcast.

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National Lampoon's Western Vacation