In message Discussion of Bee Biology writes:
>
> The bar code gizmo was developed at the Carl Hayden lab in Tucson.  They
> even got awards for the thing.  Problem was, you can't get the bees to
> run past the scanner in a way that it can reliably record the information
> -  bee goes by too fast, wrong orientation, sneaks in the back door, etc.
>
They need to have a beep like supermarkets so if the tag is not read the bee
will back up and try again.