We studied more than 500 giraffe skulls from all over Africa, and confirmed there are 4 distinct species - From power plants to saved giraffes: photographer captures eight years of USA's invisible impact in Ukraine - Giraffes may be facing extinction. IVF could help - Morphological evidence supporting four giraffe species classifications - Giraffes need endangered species protection, U.S. officials say - Giraffes' uphill battle: Slopes more than 20deg pose challenges for their conservation - US moves to list giraffes under Endangered Species Act for first time - Giraffes face extinction risks as U.S. proposes new protections - Giraffes Need Endangered Species Act Protection, U.S. Officials Say - US moves to protect giraffes, proposing crack down on body part imports