D´Orbigny’s Toad

Fascinating facts about the D´Orbigny’s Toad

• A male d'Orbigny's toad can be as small as 36 mm (1.4 in) or as large as 64 mm (2.5 in), while females range from 42 mm (1.7 in) up to 69 mm (2.7 in); one unusually long specimen measured 77 mm (3.0 in), showing the species can exceed typical size expectations.
• You’ll find this toad across three South American countries, northeastern Argentina, Uruguay, and southeastern Brazil, so its range stretches over a swath of the Pampas and nearby lowlands.
• Even in heavily farmed pastures, d'Orbigny's toads thrive, hiding in tiny holes or under stones with just their heads peeking out, proving they can coexist with intense agricultural activity.
• Breeding kicks off with the first heavy rains of spring and summer, from October through March, when the toads swarm into both temporary puddles and permanent ponds to lay eggs.
• When two related species, Rhinella dorbignyi and Rhinella fernandezae, meet, they can interbreed, hinting that what we call separate species might actually be variations of a single lineage.

At a glance

About the D´Orbigny’s Toad

Rhinella dorbignyi, a stout South American toad named for the French naturalist Alcide d'Orbigny, carries a rugged elegance across the Pampas. Males range from 36 to 64 mm and females from 42 to 69 mm in snout-vent length, though a lone individual measured a remarkable 77 mm. Its head is rounded and unusually high, crowned by a continuous, thick supra-orbital crest that gives the species a distinctive silhouette. The dorsum is a mosaic of keratinized tubercles, some conical, others rounded, adding a textured armor that blends seamlessly with the dry grasses and soil of its open-land homes. When the sun beats down, these toads often tuck themselves into tiny holes or nestle beneath stones, the head peeking out like a vigilant sentinel, ready to retreat at the slightest disturbance. A sit-and-wait predator, d’Orbigny’s toad relies on sudden strikes to capture unsuspecting insects that wander within reach. Breeding erupts with the first heavy rains of spring and summer, from October through March, as the amphibian rushes to both temporary puddles and permanent water bodies to lay its eggs. A surprising twist in its life history is the ability to hybridize with the closely related Rhinella fernandezae, hinting at a fluid genetic boundary that may blur species lines under the right ecological conditions. This adaptability, coupled with its tolerance for heavily farmed landscapes, keeps the toad thriving across northeastern Argentina, Uruguay, and southeastern Brazil, where the grasslands stretch endlessly under a bright sky.

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