Ant is very strong, able to lift an elephant without being squashed, and is able to run at super speed.
Each of the anthromorphic animals are meant to represent a different benefit the "healthier" Mighty Kids Meals offer to children.
For the goat, the Meal offers a better diet. For the Brontosaurus, the nutrients kids need to grow. For the bird, the energy healthy foods give.
But for the ant, the meal is meant to promote the dairy and protein a body needs to get stronger.