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A cobra was a species of snake native to Earth.
Chakotay had once shown Kathryn Janeway a holovid of an Indian snake charmer controlling the motion of a cobra. (VOY - String Theory novel: Fusion)
Cardassians were sometimes described as having cobra-like necks. (TNG - The Dominion War novel: Behind Enemy Lines, DS9 - Millennium novel: The Fall of Terok Nor, TOS novels: Dark Victory, Captain's Peril, Captain's Blood)
The Selay had cobra-like cranial hoods. (ST - Destiny novel: Lost Souls)