All bird feet are not the same. One size does not fit all. Different birds have different jobs in this world, and their feet, one of the main tools for the work they do, have evolved to fit the task.

Even though he’ll be 6 forever, Sesame Street’s favorite yellow bird is technically turning 55 on March 20. Big Bird, an 8-foot, 2-inch, flightless-bird that may or may not be a canary, made his way ...