Moustached Frog

Fascinating facts about the Moustached Frog

• Adult male Leptodactylus mystacinus measure 44–65 mm and adult females 54–67 mm in snout–vent length.
• Imagine a frog that builds its own bubble house underground; the moustached frog creates foam nests beneath the soil, then sends its tadpoles swimming into nearby water. This clever two-stage breeding lets them stay safe from predators and dry spells.
• From eastern Bolivia through Brazil, Paraguay, Uruguay and central Argentina, this species lives below 1,800 m (5,900 ft).
• The frog’s back may be plain, striped, or dotted with tiny dark spots, and its upper lip often carries a light stripe, details that help researchers spot it among countless grassland dwellers. Such visual cues are a reminder that even common animals carry their own subtle signatures.
• Despite expanding agriculture and cities, the moustached frog thrives in human-altered grasslands and even in remnants of forest, earning a ‘not threatened’ status from the IUCN and appearing in several protected parks. Its success underscores how some wildlife can coexist with people when habitats are preserved.

At a glance

About the Moustached Frog

The moustached frog, Leptodactylus mystacinus, is a modestly sized amphibian whose adult males range from 44 to 65 mm and females from 54 to 67 mm in snout-vent length. Its name hints at the distinctive dark brown stripe that traces the upper pair of dorsolateral folds, often flanked above by a light pinstripe that widens toward the rear. The dorsal surface may be uniform, subtly striped, or dotted with tiny dark spots, while the ventral side varies from spotless to mottled. A spatulate snout in males contrasts with the slightly less pronounced shape in females, and the narrow toe tips lack the fringes seen in many relatives, giving the frog a sleek, ground-dwelling silhouette. In the grasslands of eastern Bolivia, Brazil, Paraguay, Uruguay, and central Argentina, these frogs linger near still water bodies, where they construct underground foam nests, a reproductive strategy that shields eggs until the tadpoles hatch and drift into the shallow pools below.

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