how to tell if it is a animal signs

There are frogs and birds everywhere.yet they are the source of this mystic information. The first thing to observe is the type of animal. A common house cat on the street or under your car is no real sign. But sitting on the roof or hood is. Cats rarely climb on cars regardless of how cold it is out side and  how warm the engine is. I was driving down the street yesterday ( 3-31-15) and saw a frog hopping across the street. In the high desert there is little rain so a frog is unusual, it also being tan in color, definate omen. Roadrunners crossing the street, no mattet how busy or large, in the high desert , not big deal. However when i was sitting in my truck talking to a friend and a roadrunner jumped up on his car while the engine was running made it a definitely a sign. So any indigenous animal can be a sign but remember to study the environment and circumstance too.