Dear squirrel lovers,

I am planning to release my 4th squirrel of the year and i am wondering if there is a possibility of keeping track of him while he is rehabbing in the wild. The previous three were doing great until I lost track of them completely during last fall. This had me worried that perhaps they didn't make it for some reason or another. Does anyone know of a safe method to do this? One that would insure the animal's safety and one that wouldn't make the animal an easy target for a predator.
Your help is appreciated!
Alex