The pleasures of rubber bear poop

We got to the rangers' demo and discussion of snakes in time.  We listened to what they could tell us about snakes in the park: they aren't poisonous but they do bite.  Then, we looked at the exhibits in the nature center.  Stuffed crane, stuffed bear and other animals.  At the end, we saw a closed wooden box labeled "Whose poop?"  Inside were cards with an animal's name and a model of its scat in rubber or something like it.

The turkey poop was green.  The black bear poop was large and heavy and very black.  Our great grandson was pleased that it looked so real but wasn't.  He held the model in his hand and asked another child if she wanted some bear poop.  It looked real and she recoiled in horror.  We told him not to scare the children and he switched to offering the poop to large, somber, serious-looking men.  When one also recoiled, he admitted that what he held was rubber and the man looked relieved.

Michael Sullivan's book Serving Boys Through Readers' Advisory and his web site www.talestoldtall.com knows books and boys and he knows that younger boys, about elementary school age, are often interested in poop and in hunting and science that recognize and study animal poop.  He lists some books on the subject that might be of interest:

Sylvia Branzei. Animal Grossology. (Price Stern Sloan, 2004)

Sylvia Branzei. Grossology. (Price Stern Sloan, 2002)

Sylvia Branzei. Grossology and You. (Price Stern Sloan, 2002)

Sylvia Branzei. Hands-On Grossology. (Price Stern Sloan, 2003)

Karen Chin and Thom Holmes. Dino Dung: The Scoop on Fossil Feces. (Random House, 2004)  

We were wondering where poop models are made?  Is there much of a market for model turkey poop?  Are there blueprints of the design and its specifications?