Intro and Visual description
Hydrus has only three stars above the fourth magnitude.
Hydrus is the Little Snake, not to be confused with Hydra, the big one.
One of the eleven southern constellations created by Pieter Dirksz Keyser and Frederick de Houtman in 1596. These were published in Plate Aaa of Johann Bayer, Uranographia (1603).
Of easy-to-spot stars, the closest to the south pole is Beta-Hydri. Magnitude: 2.8. The south celestial pole actually lies in Octans the Octant.