Ocean animals and Ninja both do hide and seek for survival. Some are hunters and others are hunted, they ingeniously adapt or train themselves to life in natural environment.
Once in a while some animals help each other for their welfare. Ninja spent the same way of life too. It is also important for them to connect with other lives.
Ocean animal ninja hide and seek
Do not purchase this book. I am sorry to say that the author does not have a full grasp on the english language.