Analogies draw comparisons between items that appear to have little in common. In the following paragraph, physician Lewis Thomas draws an analogy between the behavior of ants and that of humans.

Ants are so much like human beings as to be an embarrassment. They farm fungi, raise aphids as livestock, launch armies into wars, use chemical sprays to alarm and confuse enemies, capture slaves. The families of weaver ants engage in child labor, holding their larvae like shuttles to spin out the thread that sews the leaves together for their fungus gardens. They exchange information ceaselessly. They do everything but watch television.

—Lewis Thomas, “On Societies as Organisms”