Ngorongoro Crater (Tanzania). At 610m deep and 260 sq km, this is the largest unflooded caldera in the world. A blue-green vision from above it's a haven for engangered wildlife and Maasai livestock. The crater was formed three million years ago when a giant volcano, which could have been as high as Kilimanjaro, exploded and collapsed. The caldera formed the concentric fractures in the crust cracked down to a magma reservoir deep underground. (Photo by John Bryant/Getty Images)

A veterinarian from the zoo of Besancon feeds “Soa”, a female crowned sifaka, in Besancon, eastern France, on February 18, 2019. The crowned sifaka is a critically endangered species from Madagascar. There were only 6 females over 20 individuals living in 7 zoos worldwide end of 2018. (Photo by Sébastien Bozon/AFP Photo)

A life-size replica of a Diplodocus dinosaur watches people coming out of the subway in the city center of Bochum, Germany, Monday, August 12, 2019. The exhibition, featuring models of 33 dinosaurs all around the city center, is in Bochum due to the discovery of an 316 million years old dinosaur track found in a stone pit in the city six years ago. (Photo by Martin Meissner/AP Photo)

Arnaq Egede walks to the potato field on her family's farm on July 31, 2013 in Qaqortoq, Greenland. The farm, the largest in Greenland, has seen an extended crop growing season due to climate change. (Photo by Joe Raedle/Getty Images)

A 15-year-old girl denied a horse from her parents has turned to a cow to fulfil her riding dreams. Teenager Regina Mayer, from southern Germany, is able to ride her cow, Luna. She has even trained her bovine pet to soar over a beer-crate hurdle like a regular show jumper. Why, you may well ask, when most cow-owners are surely content to let the creatures chew and lactate and sit down to indicate the imminent arrival of rain? Well, Regina's parents wouldn't let her have a horse.

Teams face off in the Cartier Elephant Polo Cup November 18, 2006 in Jaipur, in the Indin state of Rajasthan. Cartier hosted the event which was held to highlight the plight of the dwindling numbers of Asian elephants. Indian and international celebrities flew in the India's “Pink City” for the high society event held by the global watch and jewelry giant. The animal rights organization, People for the Ethical Treatment of Animals, “PETA” had planned to protest the match, saying that elephants should not be used for sport. Elephants in Jaipur are commonly used for carrying tourists at historic sites. (Photo by John Moore/Getty Images)

The hair of CSKA Moscow cheerleaders flies high as they perform during the Euroleague Basketball game between Alba Berlin and CSKA Moscow in Moscow, Russia, 04 February 2022. (Photo by Yuri Kochetkov/EPA/EFE)

Muslim women offer “Tarawih” mass prayers during the first evening of the holy fasting month of Ramadan at Sheikh Zayed Grand mosque in Solo, Central Java province, Indonesia, March 22, 2023, in this photo taken by Antara Foto. (Photo by Mohammad Ayudha/Antara Foto via Reuters)