'The desert crocodiles have adapted to the changing environment in northern Africa; 8,000 to 10,000 years ago, what is now desert was probably lush savannah and grasslands. Today the Sahara is hot and arid, the land sandy, rainfall minimal, and vegetation sparse.
"The extension of range almost certainly reflects climatic changes," said Ross. "We know that even in Roman times, the Sahara was much wetter and greener than it is now. As these places slowly dried up, remnant populations became isolated from the other crocodiles on the continent. How these populations adapted to the changing conditions is most interesting." '
Shocking how there is climate cycles. /S
The era when Rome flourished was also a period of relative warming. Hmm.