According to conservation studies, how many black rhino genetic lineages has Sub-Saharan Africa lost over the last 200 years?

How does thermal pollution affect the metabolism of aquatic animals?

From the second half of the 20th century, what has been the primary cause of the dramatic fall in the black rhinoceros population?

Genetically unique black rhinoceros populations have been lost in several African countries due to local extinctions. In which of the following countries does the species still survive?