Scientists surprised to find so many animals unknown to science in Alto Mayo, a well-populated region

Researchers in the Alto Mayo region of north-west Peru have discovered 27 species that are new to science, including a rare amphibious mouse, a tree-climbing salamander and an unusual “blob-headed fish”. The 38-day survey recorded more than 2,000 species of wildlife and plants.

The findings are particularly surprising given the region’s high human population density, with significant pressures including deforestation and agriculture.