One of the most interesting animals in the zoo is the giraffe. This is the giraffe we saw at the zoo. It is male and it is about six meters tall.

    The giraffe has big brown eyes. They are protected by very thick lashes. This giraffe has brown spots on the skin. This coloring provides the giraffe self protection from its enemies. It also has two short horns on its head.

    Like a camel, it can go for a long time without drinking water. One source of water is the leaves which it eats from trees. But the giraffe is a tall animal, so it can reach the tender leaves at the top of a tree.

   The giraffe has two methods of self protection. If something frightens an adult giraffe, it can gallop away at about fifty kilometers per hour or stay to fight with its strong legs.

The word "gallop” in the last sentence means ____.