Reticulated Giraffe at the San Fransisco Zoo. The giraffe has an incredibly long tongue (up to 18 inches!) which it uses, along with its prehensile upper lip, to strip leaves off branches. Many people think that giraffes don’t have voices, but they are capable of mooing, bleating, They can also grunt, snort, cough, whistle, and growl. Giraffes are so tall that they must spread their forelegs to the side or extend their forefeet forward & bend at the knees in order to drink or graze.