The term INCUBATION LOCATION can be summarized as 'NEST, ' a four-letter word. A NEST is a structure built by birds, mammals, or other animals to hold their eggs and young. It is typically made of twigs, grass, and other materials, and is often lined with feathers, fur, or other soft materials. Nests are used for protection and warmth, and can be found in trees, on the ground, or in other locations.