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Webster 1913 Edition

Noun.

Dung of birds.

Noun.

The dung of fowls.

muting

muting ‎(plural mutings)

The dung of birds.
- Charles Darwin
  It is more surprising that instinct should lead small nesting birds to remove their broken eggs and the early mutings […]
The process by which something is muted or silenced.
- 2012, Gary Taylor, ‎Trish Thomas Henley, The Oxford Handbook of Thomas Middleton (page 338)
  Film and dance theory offer a productive vocabulary for considering the effects of these mutings and deafenings.