There is another, more rustic whimsy I just listed that was the first I'd seen with interlocking movable parts, make it expandable--and then immediately after finding it I found this one, with interlocking cages! The cages are nicely done, each with six facets (hexagons I guess that makes them) and four "bars" that interlock. And then three links on either side. All carved from one piece of wood, with a varnish/shellac finish.
10 1/4" long expanded and 1 1/8" in diameter. Very good condition, no breaks or cracks; there is a bit of roughness to the surface of the cage interiors, original to the carving.