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The Species per Square Mile Approach. While Colombia may have almost 2000 bird species, it is a huge country with, still, complicated long-distance travel logistics. On the other hand, small countries with relatively long bird lists offer higher species densities per square mile. And why 1000?
They diverged at approximately the same time as the rockjumpers (two quite unique bird species endemic to Southern Africa and now in their own family), and as a result for a while were even placed in the same family. Forest cover in both species’ ranges is being destroyed at an unsustainable rate and these birds’ populations are dwindling.
It divides countries into categories, where the next category has 200 more species. In some cases the data are outdated, e.g. Costa Rica has 900 and not 800 species, but I made no corrections, remaining faithful to the original map data. Shown as a list, it looks like this: Less than 200 bird species: Antarctica; oceanic islands.
Approximately 2,300 bird species inhabit Africa, however as impressive as that sounds, much smaller South America boasts nearly 1,000 species more. Madagascar’s mammals are equally remarkable; over 100 species of endearing lemurs and bizarre carnivores amongst them!
When you compare the species richness not per country, but per square kilometre, that is when you get a more realistic picture, and then those tiny tropical countries rightfully stand out in the spotlights. No, I am not talking of Brazil or Columbia, they are not just in the tropics but more importantly, they are officially huge.
The Congo Basin, second in size only to the Amazon, spans six countries: south-eastern Cameroon, portions of southern Central African Republic, the north and central Democratic Republic of the Congo, Gabon, EquatorialGuinea and the Republic of Congo. million hectares of forest cover each year.
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