If used alone, concrete and sand-covered perches could harm your bird's claws, cause discomfort or even damage its delicate bones.
How Much Weight Can Your Sandcastle Hold?
The Problem with Sand and Concrete Bird Perches
Why Your Parrot Needs Many Types of Perches
DIY pedi perch or sand perch how to?? Parrot Forum 🦜 Parrot Owners Community
Flock-Talk — Pedi-perches
Why Your Parrot Needs Many Types of Perches
Fresh Concrete Turns Paw Prints and Bird Tracks Into Urban Fossils - Atlas Obscura
designed with rough sides for trimming nails and beaks, and a smooth top to protect sensitive feet. Safety perches can help keep nails and beaks
Safety Perch
Appropriate Use of Sand Perches - Kings Cages
Sand Perches: Good or Bad? - BubblyBeaks - Small Birds. Big Personalities.