The stack should be three to five layers tall. Once the frame is constructed, cover the stack with smaller limbs and branches until you have a pile three or four feet tall. A well constructed brushpile is much more valuable than a haphazard collection of yard debris. A brushpile near a water source or feeder provides escape cover for birds such as wrens, sparrows, brown thrashers, Eastern towhees, and others. When stacked in a pile or used to make a wall, many small animals seek shelter in the spaces between the rocks.
Rocks absorb radiant heat and provide frogs, lizards and butterflies with basking areas.
Many invertebrates can be found under and around rockpiles and walls giving frogs and lizards places to feed. Stone walls made of stacked rocks make nice borders for gardens or flower beds. Flagstone is very popular for this type of wall. The rocks are flat, stack easily and provide numerous nooks, crannies, and crevices for critters to hide in.