. >> reporter: 50 years ago, kerry spinny was a puppeteer in search of a purpose when muppet creator jim henson asked him to join his team. >> he said, i'm going to be involved with a new show. ♪ ♪ how to get to sesame street ♪ >> and would you be interested in working with the muppets? >> reporter: in the day-to-day goings on of "sesame street" there needed to be an innocent. >> look at that. see, it's got letters on it. >> reporter: a character without guile. his was a child's voice that came from the beak of an 8'2" bird ♪ he said the world's full of different birds ♪ >> i was one of those kinds of kids that always wanted to do the right thing. that's what big bird's trying to be, a good kid. >> reporter: awkward, flightless and sweet, big bird was the perfect counterpart to oscar the grouch, who was also played by spinney. >> oscar's kind of cool. it's fun to play somebody very different from one's self. on the other hand, big bird is my kid. in some ways, i love him best. >> reporter: he says big bird brought him all over the world, opened his mind, and nurtured his soul. >> la,