(Images: Kasper Palsnov/AFP/Getty) If you don't want to know what the inside of a giraffe looks like, look away now. Marius, an 18-month-old male from Copenhagen Zoo , was put down on Sunday ...

Another explanation offered for one of animal kingdom’s most distinctive features. Giraffes might have evolved their long necks to keep cool. Credit: Getty How did the giraffe get its long neck?