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8     an ant-acacia
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Ant-acacias are generally small shrubby trees 1 to 5 m tall as reproductive adults. There is about 2 m of trunk below the first large branch of the Costa Rican Acacia collinsii in this photograph of a representative ant-acacia (the tree is about 5 m tall). This tree is about 5 years old (or at least, five years since it became occupied by a protective ant colony). This crown will be occupied by one colony of Pseudomyrmex acacia-ants.
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