The Halanans were a telepathic humanoid species native to the planet New Halana. The Halanans chose a companion for life and would not leave them. Another major feature of the species was their psychoprojective telepathy. They had ears somewhat larger than a Vulcan's, split into two points at the top bearing a resemblance to the Ocampa, but otherwise closely resembled humans.
Sometime in the 24th century, the species moved to New Halana that was terraformed by Gideon Seyetik. (DS9: "Second Sight")