Meaning of least bittern in English:

least bittern

noun

  • A small bittern native to temperate and tropical regions of the Americas, Ixobrychus exilis, having light brown plumage with darker streaks, white underparts, and (in the male) black patches on the crown and back.

Origin

Early 19th century; earliest use found in Alexander Wilson (1766–1813), ornithologist and poet.