Neck and neck
Nubian giraffe bulls engage in a bout of "necking" — a type of combat using their necks as weapons — in Murchison Falls National Park in Uganda. This subspecies is now thought to belong to the northern giraffe species.
All in the Family: Giraffes are 4 Species (Photos)
Mindy Weisberger is a Live Science senior writer covering a general beat that includes climate change, paleontology, weird animal behavior, and space. Mindy holds an M.F.A. in Film from Columbia University; prior to Live Science she produced, wrote and directed media for the American Museum of Natural History in New York City. Her videos about dinosaurs, astrophysics, biodiversity and evolution appear in museums and science centers worldwide, earning awards such as the CINE Golden Eagle and the Communicator Award of Excellence. Her writing has also appeared in Scientific American, The Washington Post and How It Works Magazine.