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Method Review: Estimation of Colony Densities of the Army Ant Eciton burchellii in Costa Rica

We evaluated the performance of a method developed to estimate colony densities of the army ant Eciton burchellii, a keystone species, based on raid crossings on trails, in Costa Rica. The method was compared with a census obtained by tracking ant‐following birds, and the effect of walking distance and rainfall was evaluated. We found that the method performs well when at least 60 km of trail have been walked (replicated walks are permissible), and when rainfall is avoided.