Peruvian Amazon reveals 27 new species, including web‑footed mice

During an expedition in the Peruvian Amazon in 2022, Conservation International scientists discovered 27 new species. Among them were "amphibious mice" with webbed feet and fish with "bizarre, blobby heads."

The expedition, which took place in the protected forest area of Alto Mayo (northern Peru), discovered a new squirrel species, eight fish species, three amphibians, and ten butterflies. Trond Larsen from Conservation International, who led the expedition, reported finding 48 other species that may be new to science but require further investigation.

We were very surprised to find such high biodiversity in a landscape with so much human influence – said Larsen in an interview with CNN.

Among the discovered species were fish with "bizarrely swollen heads," which resemble a "large, swollen nose." Scientists are not sure of the function of this structure, although they suspect it may be used for detecting food. The new species of squirrel, measuring just 6 inches, is characterized by a chestnut-brown color and quick movements.

(The squirrel) fits so easily in the palm of your hand. Adorable and beautiful chestnut-brown color, very fast - said Larsen.

BBC reported that scientists have also described a new species of spiny mouse, named for its protective stiff hairs, which function similarly to the spines of a porcupine. In addition to the "amphibious mouse," which swims and feeds on aquatic insects, scientists have described a new species of spiny mouse.

The expedition lasted 38 days and involved 13 scientists, local workers, and Indigenous community members. Researchers collected DNA samples using cameras and bioacoustic sensors. According to the International Union for Conservation of Nature (IUCN), 2,000 species were identified, of which 49 are threatened with extinction.

Trond Larsen emphasized that these discoveries support protecting this area to ensure its future survival.