Abstract
We report observations and experiments on associations of the frogs, Phrynomantis microps and Kassina fiisca, and the ponerine ants, Megaponera foetens and Paltothyreus tarsatus, in a West African savanna. Several experiments show that the tolerant behavior of the ants toward these frogs is due to chemical components of the frogs' skin. Comparisons to other syntopic frog species suggest that this enables these frogs to make use of burrows that otherwise are unavailable. This is advantageous because in the savanna, most hiding places that remain moist during the dry season are occupied by ants.
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