MIAMI, United States (AFP) — There are actually four species of giraffe, not one as previously believed, researchers said Thursday in a discovery that could change conservation efforts for the world’s tallest mammal. The study in the journal Current Biology is based on DNA evidence from skin biopsies of 190 giraffes across Africa. Giraffe populations have dropped dramatically in Africa over the past few decades, going from about 150,000 to less than 100,000. But giraffes have […]