'Serpent' in the Bible

as if a man fled from a lion, and a bear met him; or went into the house and leaned his hand on the wall, and a serpent bit him.

and though they hide themselves on the top of Carmel, I will search and take them out thence; and though they be hid from my sight in the bottom of the sea, there will I command the serpent, and it shall bite them;