There are innumerable kinds of living creatures on the face of the earth. From pets such as cats, which we come across everyday, to animals inhabiting virgin forests, every species has wondrous features and amazing skills. We are surprised to see how bees can build such perfect honey combs and can do calculations as if they were expert mathematicians. As we see how considerate a crocodile or a lion is to its young, we wonder how such wild animals can behave so affectionately. We seek an answer to the question how can little birds, which cover thousands of kilometres during a non-stop migration, perform this hard task. The more detailed information we get, the more amazed we become.