< Comparison of crank based leg mechanism  
        
      Serious:
- http://www.mechanicalspider.com/comparison.html
 - http://www.amandaghassaei.com/files/thesis.pdf
 - Shigley, Joseph E. “The Mechanics of Walking Vehicles: A Feasibility Study.” University of Michigan Department of Mechanical Engineering. 1960.
 - http://davidbuckley.net/RS/WalkerMechanisms/SimpleWalkerMechanisms.htm
 
Just for fun:
- Walking T-Rex based on a modified Jansen Linkage:
 
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