The other day I was wondering about the animal world and how they perceive their lives.Specifically I was wondering if they require or have constructed ways of "measuring" their days in which thay move through. What I mean to say is that we as humans think of our yesterdays,what we had or had not done, our futures,our plans hopes and wishes and our present here and now moments, where ideally it would be to our greatest advantage to be living in.We also have created a 365 day calender and a 24 hour way of measuring time.