Bahia Smooth Horned Frog

Fascinating facts about the Bahia Smooth Horned Frog

• At just 40–70 mm long (about 1.6–2.8 in), this robust frog fits easily on a palm, yet its warty skin and bold geometric pattern of brown, black, yellow, orange and red make it practically invisible among leaf litter.
• A stomach-content study found that roughly 40% of its meals are beetles and another 25% are grasshoppers or crickets.
• When startled, it launches into a leap then flattens its limbs and spreads its skin bumps, mimicking a dead leaf so convincingly that visual predators often pass it by, a defense now known in at least seven frog species across four families.
• Its tadpoles develop in swampy streams, adopting a benthic lifestyle with an elliptical, light-brown body marked by darker spots and a gold-spotted belly, a coloration that helps them blend into the streambed.
• Despite habitat loss from agriculture, logging and tourism, the species is classified as “least concern” because it occupies a wide range of protected areas, from Parque Nacional da Tijuca to Reserva Biológica Augusto Ruschi.

At a glance

About the Bahia Smooth Horned Frog

Proceratophrys boiei is a robust, medium-sized amphibian that reaches 40–70 mm in length, with females typically out-sizing the males. Its head and body are broad, the snout rounded, and distinctive, tapering skin peaks crown the eyes like tiny horns. The back and flanks are a mosaic of warts painted in irregular geometric patches of brown, black, yellow, orange and red, intersected by a broad brown or grey dorsal stripe. This flamboyant yet cryptic palette renders the frog virtually invisible among the leaf litter of Brazil’s eastern and southeastern forests, where it dwells in primary and secondary woodlands, forest edges, and even degraded patches adjacent to forest. When threatened, it executes a sudden leap and then flattens its limbs, assuming a stiff-legged posture that, combined with its textured skin, mimics a dead leaf, a defensive trick now documented in at least seven frog species across four families. Its diet is insect-rich: beetles make up roughly 40 % of stomach contents, while orthopterans account for another quarter. Reproduction occurs in swamps and streams, where eggs hatch into benthic tadpoles with elliptical bodies, dorsolaterally placed eyes, a light brown hue marked with darker spots and a golden belly.

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