> but that would be so rare in a world without humans heaping up big piles of the stuff Hogs will heap up lots of organic debris and sleep in it, choosing stra

> but that would be so rare in a world without humans heaping up big piles of the stuff Hogs will heap up lots of organic debris and sleep in it, choosing strategically where to urinate in order to increase or decrease the heat emitted by the pile. > The distinctive “pigloos” the animals build consist of mounds of cattails, which they cut down and burrow into, capturing enough heat to steam on cold days, Brook explains. https://www.nationalgeographic.com/animals/article/huge-feral-hogs-swine-spreading-through-north-canada https://www.nationalgeographic.com/animals/article/huge-fera... and https://feralhogs.extension.org/signs-of-presence/#:~:text=Feral%20hogs%20build%20farrowing%20nests,be%20difficult%20to%20tell%20apart https://feralhogs.extension.org/signs-of-presence/#:~:text=F.... > Farrowing nests are rooted-out areas typically round to oval in shape (Figure 8). Nests range in size from 3 to 8 feet long, 2 to 7 feet wide, and 2 to 7 inches deep. Sows excavate these shallow depressions for giving birth to their young. Sows line the nests using readily-available material in close proximity, or some nests are unlined. Nests found in colder or open habitats are more elaborate than those found in warmer or forested habitats. Elaborate nests can have dome-like covers made of vegetation piled to 4-feet high.