France, July 5 -- Local guides in Tanzania have made an unexpected discovery on the icy heights of Kilimanjaro - a river frog spotted at over 4,000 metres altitude. While its spectacular leap to Africa's highest mountain reveals the potential of the continent's little-known alpine wildlife, it also raises concerns over climate change.

Named Amietia wittei after Belgian herpetologist Gaston-Francois De Witte, the frog was thought to live only at lower altitudes, so members of an expedition up Kilimanjaro were not looking for amphibians.

"We wanted to observe the scarlet-tufted malachite sunbird - a tiny colourful bird resembling a hummingbird, fond of nectar," said Dmitry Andreichuk, co-founder of Altezza Travel agency.

"We know it live...