Status Updates From The Voyage of the Beagle

“Seeing this graduation and diversity of structure in one small, intimately related group of birds, one might really fancy that from an original paucity of birds in this archipelago, one species had been taken and modified for different ends.”

Darwin tells of a Dr Smith in Southern Africa who saw on a day's march 'without wandering to any great distance on either side, between one hundred and one hundred and fifty, which belonged to three species in the same day'...
In the early 1900s, a hundred years later the white rhino faced extinction with numbers as low as 50 to 100. Now thanks to conservation efforts numbers have risen to over 15000.