A bird sand perch is made of coral and other abrasive materials, that can be attached to the walls of a birdcage to provide a rough surface for birds to stand on. The rough texture of the sand perch helps to keep a bird's nails and beak trimmed naturally as they climb and perch on it.
Bird sand perches can also provide a comfortable place for birds to rest and can help to prevent foot problems caused by standing on smooth or slippery surfaces for long periods of time. They come in a variety of shapes and sizes to accommodate different bird species and cage sizes.
It's important to note that while sand perches can be beneficial for birds, they should not be used as the only source of perching surfaces in a birdcage. Birds also need a variety of other perch sizes and textures to promote natural behaviors and exercise.