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  2. Guided by its trainer, a crab crosses the finish line at the annual Buccoo Goat and Crab Race Festival on the island of Tobago.

    Some of the strangest photos you’ll see all week

     

  3. The awkward march of the military’s Robo-mule was sturdy, if inelegant. Now, the newest animal-inspired robot sponsored by the Pentagon’s Defense Advanced Research Projects Agency (DARPA) takes its cues from a much faster beast: The cheetah. Robo-cheetah is “freakily fast,” clocking in at 18 miles per hour.  At this rate, says Andy Greenberg at Forbes, such robots may one day "leave flesh-and-blood animals in the dust, too."