(or iaculus, pl. jaculi
, meaning "thrown" in Latin) is a small mythical serpent
. It can be shown with wings and sometimes has front legs. It is also sometimes known as the javelin snake.
It was said that the jaculus hid in the trees and sprang out at its victims. The force of it launching itself at the victim led to the association with javelins. Pliny
described it as follows: "The jaculus darts from the branches of trees; and it is not only to our feet that the serpent is formidable, for these fly through the air even, just as though they were hurled from an engine.
Lucan also describes the attack of the jaculus in the Pharsalia. He explains that it is the wound caused by the jaculus hitting the victim that causes death. The jaculus does not kill with venom.
This is similar to one of the snakes of Madagascar, the fandrefiala snake. It too, falls from a tree like a spear to stab animals, and is most feared by the locals. The fandrefiala snake is in fact known to modern science as Ithycyphus perineti. It has V-shaped head markings which resemble a spearhead.
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