Layer's Lair is a term used to describe a place where birds or other animals can NEST and ROOST. It is usually a sheltered area, such as a tree hollow or a cave, that provides protection from predators and the elements. The term 'LAYER's Lair' is derived from the word 'LAYER, ' which is an old English word for a bird's NEST. Roosting is the act of perching or settling in a safe place, usually at night, and nesting is the act of building a NEST to lay eggs in.