Peru

When the reeds are fresh, they are green and have a waterproof outer seal. They re-build their huts from the green reeds right before the rainy season (that's about now) so they'll have water-resistant houses. A whole family may sleep in one of these small huts. The body heat will keep them warm (we're at over 13,000 ft.), but it also creates a very humid environment inside. This high humidity is responsible for the very high mortality rate of 27% of all children between 1-3 yrs.