The Collaborative International Dictionary of English v.0.48:

Stake-driver \Stake"-driv`er\ (-dr[imac]v`[~e]r), n. (Zool.)
   The common American bittern (Botaurus lentiginosus); -- so
   called because one of its notes resembles the sound made in
   driving a stake into the mud. Called also meadow hen, and
   Indian hen.
   [1913 Webster]