experiments have shown that some animals have an extraordinary sense of direction.
the zip is a good example of this.
In 1957, some scientists took eighteen zips from their home on the island of Midway in the Pacific Ocean.
these zips were sent by airplane to some distant pkaces, such as Japan, the Philippines, and the Hawaiian Island.
then they were set free.
scientists already knew that zip could fly for great distances because of their huge wings.
but no one thought that the zips would be able to find their way home.
after all, midway is just a very little island in the middle of a very large ocean.