The Collaborative International Dictionary of English v.0.48:

droppings \droppings\ n. pl.
   fecal matter of animals; plural of dropping[2].

   Syn: dung, muck.
        [WordNet 1.5]

WordNet (r) 3.0 (2006):

droppings
    n 1: fecal matter of animals [syn: droppings, dung, muck]

Moby Thesaurus II by Grady Ward, 1.0:

26 Moby Thesaurus words for "droppings":
   BM, bowel movement, buffalo chips, ca-ca, coprolite, coprolith,
   cow chips, cow flops, cow pats, crap, defecation, dingleberry,
   dung, feces, feculence, guano, jakes, manure, movement, night soil,
   ordure, sewage, sewerage, shit, stool, turd