What are some crude shelters?

Crude shelters include basic structures like lean-tos, which are formed by leaning branches against a support, and debris huts, made from natural materials like leaves and sticks. Other examples are tarps or emergency blankets stretched over a frame for temporary cover, and earth shelters, which involve digging into the ground for insulation. These shelters provide minimal protection from the elements and are often used in survival situations or by those without permanent housing.