The document summarizes key facts about giraffes, including their evolution, habitat, anatomy, behavior, and threats. It discusses how giraffes evolved longer necks for accessing food. It notes that while once widespread in Africa, their populations have declined and several subspecies are now endangered. Their unique circulatory system allows blood to reach their head despite their great height. Predation and poaching are major threats, with lions, hyenas and humans killing calves and weaker animals.