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Compare it to the size of other animals that we know the weight of. If you have a tiny femur from an extinct mammal that is only 3 inches long, it probably weighed only a few lbs max. If it was like 2 feet long, you’re probably talking 100+ lbs. Bones that are really thick for their length are made to bear more weight. An elephant femur is about twice as long as a human femur, but 7-8x the diameter. So an elephant femur ends up being about 16x the total mass of a human femur. Bones built like this are used to carry heavy loads.
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