From https://www.nuernberger-hausbuecher.de/

I want to know how this bird trap mechanism works, as shown by this bird hunter of the medieval period on the book image, and it doesn't seems to have any bait in it either.

As a non-European native (nor do I live there), I have no idea at all how this works or if this trap is still being used today.

Feel free to edit my grammar and tag to be appropriate since I don't know what tag is appropriate for this.

www.nuernberger-hausbuecher.de provides the illustration below:

I want to know how this bird trap mechanism works, as shown by this bird hunter of the medieval period on the book image, and it doesn't seems to have any bait in it either.

As a non-European native (nor do I live there), I have no idea at all how this works or if this trap is still being used today.

Feel free to edit my grammar and tag to be appropriate since I don't know what tag is appropriate for this.