Workers
The workers of army ants are usually blind or can have compound eyes that are reduced to a single lens. There are species of army ants where the worker caste may show

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Army ant syndrome
The army ant syndrome refers to behavioraland reproductive traits such as obligate collective

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The whole colony of army ants can consume up to 500,000 prey animals each day, so can have a significant influence on the

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Army ants do not build a nest like most other ants. Instead, they build a living nest with their bodies, known as a bivouac. Bivouacs tend to be found in tree trunks or in burrows dug by the ants. The members of the bivouac hold onto each other's legs and so build a sort of ball,

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Historically, "army ant" in the broad sense referred to various members of five different ant subfamilies. In two of these cases, the

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• Hermann, Henry R., ed. (1982). Social Insects. Volume IV. New York: Academic Press. ISBN 978-0-12-342204-0. OCLC 37854847. |volume= has extra text (help)

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Many species of army ants are widely considered to be keystone speciesdue to their important ecological role as arthropod predators and due to their large number of vertebrate and invertebrate associates that rely on army ant colonies for nutrition or protection.

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