If used alone, concrete and sand-covered perches could harm your bird's claws, cause discomfort or even damage its delicate bones.
Bird Baths 101: How to Create a Bird-Friendly Watering Hole in Your Garden - Bird Buddy Blog
The Modern Apprentice - Raptor Perches
Concrete Bird Bath - Bird Watching Academy
Appropriate Use of Sand Perches - Kings Cages
26-in H Natural Concrete Birdbath Pedestal in the Birdbaths department at
How to Trim Your Bird's Nails
Where should I keep my birds? – RSPCA Knowledgebase
Fresh Concrete Turns Paw Prints and Bird Tracks Into Urban Fossils - Atlas Obscura
Choosing the best bird bath
26-in H Natural Concrete Birdbath Pedestal in the Birdbaths department at
How to Trim Your Bird's Nails
Flock-Talk — Pedi-perches