Ant (Franchise)

Although the ant is a common insect worldwide, it is only mentioned once in the graphic novel, The Serpent's Heir.

Description
Ants are insects of the Family  Formicidae and are best known for their clearly segmented bodies and complex social structure. Ants occur on all continents except Antarctica, as well as several islands such as Greenland and Iceland. Ants have evolved to be very specialized, depending on the environment and species. Generally, an ant colony consists of at least one queen, a few fertile males, and worker ants. Depending on the species and social structures, there may be other social groups such as sterile females. Ants are largely wingless insects, but the queen ant may have wings, using them for mating flights but loosing them afterwards.

Function
In the How to Train Your Dragon Franchise, ants have no function other than as a size comparison.

In actuality, however, ants have a number of uses for humans including as a food source for some cultures, biological pest control, traditional medicine, as an object of scientific study, and even as pets in a well-contained terrarium.

Ants can also be pests to humans, such as the invasive and venomous Fire Ant.

The Serpent's Heir
Images of ants do not appear, but Astrid refers to them when comparing the size of humans to that of the Foreverwing.

"--As well as the Foreverwings themselves. We're gonna look like ants to them."

- Astrid