Nodders in the collectible world of salt & pepper shakers can be rare and hard to find. I "bought out" over 600 sets of salt & pepper shaker collection. I have sold some at auction, in my booths and now have listed some on ebay. Click on Where to Find Me seller site at right to see what I have on ebay.
Nodders have a portion of the shaker that rests on or in a base so that they can swing from side to side or back to front. Here are pictures of two I have listed now and I plan to list more nodders next week.
The top picture shows the back of set and how they can lean forward - those are chickens. They have little pegs on each side that holds them inside the holes. The part that nods is also the shaker part. If you ever go to a flea market or thrift store, make sure to look at the kitchenware department, you just might find a nodder. Blessings from Wisconsin.