Did you know that a giraffe's tongue is 18 inches long? Or that the tip of it is black? Well now you do. In the wild, giraffes use their long tongue to wrap around a tree branch and strip the leaves off of it. Consequently their tongue has to be very strong and durable. The black color helps them to avoid getting a sunburn, since they spend so much time with their tongue sticking out. Can you imagine getting a sunburned tongue? Ow.
This photo comes from the Milwaukee Zoo, where, at scheduled times, zookeepers hand out biscuits to zoo guests and allow them to feed the giraffes.