"Svalan"

Nice work!  How did you attach the birds to this one?

The birds are made of paper and coated multiple times with acrylic paint to give them some bulk.  I then glue them to the inside surface of the glass with a tiny dab of super glue.  From a distance and when photographed, they appear to be flying freely inside the bottle.

Thanks for the explanation about the birds.  They do look so life like, and as if they are flying freely.  Awesome work.