Cliffside Nest is a term used to describe the nesting sites of certain birds of prey, such as eagles and hawks. The term 'AERIE' is often used to refer to these nests, which are typically built on high cliffs or other elevated areas. These nests are usually made from sticks and twigs, and are often lined with grasses, feathers, and other materials. The birds use these nests to raise their young and protect them from predators.