Sources : Ant-lion

Isidore of Seville [7th century CE] (Etymologies, Book 12, 3:10): The ant-lion is so called either because it is equally lion and ant, or because it is the lion of ants. It is a small animal that is hostile to ants; it hides in the sand and kills other ants that are carrying grain. In this way it is like a lion to ants though it is like an ant to other animals.