Dan, I saw in the comments below one video that the black rhino is officially extinct...sorrrow.
I learned also they are not only different species, but also different genus! The white rhino likes foliage of acacia trees...someday I may compare acacia between other continents and North America, because we have them here, too, in the deserts of the American southwest and I love them very much, I like to camp by them! (Catclaw acacia here.)