Siberian ibex
The wild goat species form a closely related group with complicated internal systematics. Externally, the various forms are distinguished mainly by the sometimes very large horns of the males, while the females are also relatively similar between species. On the basis of the horns of the males one believed for a long time to be able to distinguish different species or species groups. Alpine ibex, Siberian ibex and Nubian ibex, for example, look very similar and were considered to be particularly closely related. What remained puzzling was the fact that the ranges of these three forms are separated by those of other wild goat species. Genetic studies, however, strongly suggest that the Siberian Ibex and the Nubian Ibex each represent separate species, with the Siberian Ibex standing at the base of the genus Capra