Definitions:

1. In ancient mythology and literature, refers to a legendary flying serpent or darting snake that was said to launch itself at its prey like a thrown javelin. NOUN
   • Ancient texts describe the jaculus as a sepent so fast that it could strike before its prey even noticed.
2. In zoological context, refers to a genus of desert-dwelling rodents known as jerboas, found in North Africa, the Middle East, and Central Asia. NOUN
   • Unlike most rodents, the jaculus relies on powerful hind legs to escape predators in the dunes.

Synonyms:

• flying serpent
• jerboa
• jumping rodent