Evolution of cetaceans decreasing. Other historical climate events can be correlated and matched with the genome history of the Yangtze River dolphin as well. This shows how global and local climate change can drastically affect a genome, leading to changes in fitness, survival, and evolution of a species. The European population of common dolphins ("Delphinus delphis") in the Mediterranean have differentiated into two types: eastern and western. According to a 2012 study, this seems to be due to a recent bottleneck as well, which drastically decreased the size of the eastern Mediterranean population. Also, the lack of population structure between the western and
Wildlife of Libya of now, very few animals live in the area, like the striped hyenas ("Hyaena hyaena"), fennec fox, gazelles, wildcats and golden wolves. The cheetah is now extinct from the area. Reptiles and rodents are common in the sands of the desert; adder and krait are among the snakes reported. Red shrimp are reported from the Ubari Lakes in the Fezan area. The faunal species recorded include "Canis anthus", "Vulpes vulpes", "Genetta genetta", "Felis libyca", "Hystrix cristata", "Delphinus delphis" and "Tursiops truncatus". Mammals and reptiles found in Libya which are on the Red List of IUCN, are: Grobben's gerbil, the Alexandrian