mothernature is far more advanced than what we phantom in our minds. evolution i s indeed great, it learns from the surroundings and adjusts itself accordingly; a kind of self diagnostic. Nature must have noticed that tilting back to walking position has been a problem for a long time, each time an insect tilts over, the memory of that incidence is being coded bit by bit into the DNA and the process of evolution starts. Over a long period of time, nature finds a solution from the information it has gathered. Life is really an intelligent creation.