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Whistling heard near Peru road leads researchers to green creature. It’s a new species

A new species of frog was discovered in Peru when researchers heard it whistling in a rainforest, according to a study.
A new species of frog was discovered in Peru when researchers heard it whistling in a rainforest, according to a study. Castillo-Urbina E, Vences M, Aguilar-Puntriano C, Glaw F, Köhler J via Vertebrate Zoology

Equipped with headlamps and torches, a group of researchers trekked through a rainforest in central Peru, listening carefully. That’s when they heard a whistling coming from near a road — it was a new species.

Researchers said they collected four of the small whistling frogs and determined that they are a new species known as Pristimantis loeslein, according to a study published Nov. 14 in the journal Vertebrate Zoology.

The collected specimens measured between approximately 0.8 inches and 0.9 inches, researchers said.
The collected specimens measured between approximately 0.8 inches and 0.9 inches, researchers said. Castillo-Urbina E, Vences M, Aguilar-Puntriano C, Glaw F, Köhler J via Vertebrate Zoology


The frogs have a slender body with a wide head, the study said. Their skin is smooth on their backs, bumpy on their sides and coarse on their underside.

Scientists said the specimens varied in size, measuring between approximately 0.8 inches and 0.9 inches. They have long fingers that are not webbed and a tapered, pointy snout.

The creatures are yellow-green to olive green with a “bright yellow’ belly, according to the study. The frogs have dark markings on their backs — including reddish marbling on their heads, a dark line between their eyes, and two curved lines extending down their bodies.

The brightly colored creatures have a green back and yellow belly.
The brightly colored creatures have a green back and yellow belly. Castillo-Urbina E, Vences M, Aguilar-Puntriano C, Glaw F, Köhler J via Vertebrate Zoology

Their large, bulging eyes are bronze with a copper streak, researchers said. Their limbs vary in color, ranging from brown to a gray-pink.

The frogs’ call sounds “like a short pronounced whistle,” co-author Jörn Köhler told McClatchy News in an email. It was discovered near a main road that connects the Andes mountains to the Amazon rainforest.

Specimens were found calling from bushes and other low shrub vegetation along the road, according to the study. They are only known from the location where they were discovered, but experts anticipate that they likely live in other areas of rainforests in central Peru.

The new species was named after a German family with the last name Löslein in honor of their support of research and conservation in Peru, researchers said.

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This story was originally published November 15, 2023 at 4:53 PM with the headline "Whistling heard near Peru road leads researchers to green creature. It’s a new species."

Moira Ritter
mcclatchy-newsroom
Moira Ritter covers real-time news for McClatchy. She is a graduate of Georgetown University where she studied government, journalism and German. Previously, she reported for CNN Business.
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