
The article takes about the competitve environment that the Harbaugh brothers grew up in along with their passion and work ethic to be the best they can be. Here is a good excerpt:
It is a ruthless world, and the Harbaughs love it that way: There is no faking success, none of what their mother called "mediocrity—let's not let anybody be better than anybody else." John, whose Ravens are 5--2 and leading the AFC North, keeps a plastic armadillo in his office because he thinks people need thick skin, and he often asks his players, "You got your baby-deerskin on today? Or do you have your armadillo skin?"
Full Article on Harbaugh Brothers