1) Genus jaculus 2) Greek legendary creature 3) Jerboas 4) Mammal genus 
The jaculus (or iaculus, pl. jaculi, meaning `thrown` in Latin) is a small mythical serpent or dragon. It can be shown with wings and sometimes has front legs. It is also sometimes known as the javelin snake. ==In mythology== It was said that the jaculus hid in the trees and sprang out at its victims. The force of it launching itself at the vict.....[rodent] Jaculus jaculus The genus Jaculus is a member of the Dipodinae subfamily of dipodoid rodents (jerboas). Jaculus species are distributed in desert and semi-arid regions across northern Africa, the Sahara, the Horn of Africa, Arabia, the Middle East, and Central Asia. Collectively, the species within the genus may be commonly referre...
[n] - jerboas
genus Jaculus noun jerboas