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Reading: Tiny frog that’s smaller than a penny discovered deep in jungle
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A new species of tiny, poisonous frog named Ranitomeya aquamarina has been discovered in Brazil's Amazon, boasting vibrant colors and rare monogamous behavior.
Nature and Wildlife

Tiny frog that’s smaller than a penny discovered deep in jungle

William McGee
Last updated: 2025/05/05 at 6:13 PM
William McGee
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2 Min Read
The frog species that is called Ranitomeya aquamarina. (Jam Press/Alexander Tamanini Mônico)
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A tiny frog that’s smaller than a penny has been discovered deep in a jungle.

The poisonous amphibian measures only 15.4mm to 18.5mm.

The frog species – called Ranitomeya aquamarina – was described for the first time in the scientific journal ZooKeys.

READ MORE: Traditional cod and chips should be off the menu for Brits if we want to save planet, say boffins

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It was found along the Eiru River near Eirunepé in Brazil’s Amazon jungle.

A new species of tiny, poisonous frog named Ranitomeya aquamarina has been discovered in Brazil's Amazon, boasting vibrant colors and rare monogamous behavior.
Geographic distribution of the Ranitomeya aquamarina. (Jam Press/Alexander Tamanini Mônico)

It is the first new species of the genus Ranitomeya to be described in more than 13 years.

The frog has stripes down its back that are “metallic pale yellowish green to metallic pale turquoise-green”.

And its limbs are “metallic chrome with dark carmine spotting”, according to the researchers, as reported on What’s The Jam.

A new species of tiny, poisonous frog named Ranitomeya aquamarina has been discovered in Brazil's Amazon, boasting vibrant colors and rare monogamous behavior.
The frog species that is called Ranitomeya aquamarina. (Jam Press/Alexander Tamanini Mônico)

Alexander Tamanini Mônico et al. believe its psychedelic appearance serves to warn predators of its toxicity.

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The boffins were also taken aback by its apparent monogamous behaviour, which is rare among amphibians.

They wrote: “Most of the time, we observed adults as couples…

A new species of tiny, poisonous frog named Ranitomeya aquamarina has been discovered in Brazil's Amazon, boasting vibrant colors and rare monogamous behavior.
The frog species that is called Ranitomeya aquamarina. (Jam Press/Alexander Tamanini Mônico)

“(W)hen we captured the females, the respective males called incessantly.”

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Despite their glee at the discovery, the experts warn that Ranitomeya aquamarina may not be abundant.

The species was only found in one of four sites surveyed by the research team.

A new species of tiny, poisonous frog named Ranitomeya aquamarina has been discovered in Brazil's Amazon, boasting vibrant colors and rare monogamous behavior.
Preserved holotype of Ranitomeya aquamarina. (Jam Press/Alexander Tamanini Mônico)

More studies are needed to determine its conservation status.

Mônico wrote on social media that the new species is “one of the most beautiful I’ve ever seen in my life”.

READ MORE: Fisherman catches ZOMBIE fish weighing a whopping 100lbs

A new species of tiny, poisonous frog named Ranitomeya aquamarina has been discovered in Brazil's Amazon, boasting vibrant colors and rare monogamous behavior.
Preserved tadpoles of Ranitomeya aquamarina. (Jam Press/Alexander Tamanini Mônico)

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