The "wood duck" (Aix sponsa) also known as the summer duck and the Carolina duck is designated as the official state duck.
S.C. Code Ann. § 1-1-711
Official state duck
2009 Act No. 58, SECTION 1, eff upon approval (became law without the Governor's signature on June 3, 2009).
Official source: South Carolina Legislature. Reproduced from public-domain South Carolina statutes; confirm against the official source for the current text. Not legal advice.