Please note credits and captions for the images below. Also please note additional caption as follows for the first two images in the gallery:
"During climate change, rare species can cling on in mountain refugia. Images are of Barbour's forest tree frog (Leptopelis barbouri) in the Udzungwa (image 1) and Usambara (image 2) Mountains, Tanzania. The two populations have been isolated on separate mountain ranges for millennia and genetic sequencing reveals they are now distinct species. Photos: Michele Menegon (www.michelemenegon.it)"