So, here's some thoughts about archaeological theory here...
Size of poop can be related to diet - meat heavy diets provide less waste, while plant heavy diets (rich in fiber!) provide um... more. Giants are portrayed as either meat exclusive or primary eaters (true carnivorous mammals are a little rare). Extrapolating to the Inuit of Siberia, it is possible for pastoralists to maintain an almost exclusively meat diet. The bigger you get, the harder it is to maintain though. Pastoralists also require a great deal of territory, over which to spread the poop as well. Hm... wonder what those rounded, low lying mountains are made of?
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Size of poop can be related to diet - meat heavy diets provide less waste, while plant heavy diets (rich in fiber!) provide um... more. Giants are portrayed as either meat exclusive or primary eaters (true carnivorous mammals are a little rare). Extrapolating to the Inuit of Siberia, it is possible for pastoralists to maintain an almost exclusively meat diet. The bigger you get, the harder it is to maintain though. Pastoralists also require a great deal of territory, over which to spread the poop as well. Hm... wonder what those rounded, low lying mountains are made of?