Crows' nests are structures built by CROWS to house their eggs and young. They are typically made of sticks and twigs, and are often found in trees or on top of buildings. The term 'CROWS' nests' is also used to refer to the lookouts on ships, which were traditionally placed at the highest point of the ship. The crossword solution for this term is 'tepees, ' which are cone-shaped dwellings made of animal skins and wooden poles, traditionally used by Native American tribes.