Spinney played the two iconic characters on "Sesame Street" since is debut in 1969 before he announced his retirement previous year.
He leaves behind an enduring legacy of kindness, with his loving world view having helped shape Sesame Street into the unmistakable force for good it remains to this day.
Abby Cadabby, Big Bird, and Elmo, characters from "Sesame Street", pose for a photo following the Kennedy Center Honors State Department Dinner at the State Department on Saturday, Dec. 7, 2019, in Washington.
Spinney appeared in "The Muppet Movie", "The Great Muppet Caper", "Big Bird in China", and "Follow that Bird".
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He had retired past year at the age of 84. Eventually, Spinney said he turned BB into a "big kid" character - and the rest was history.
Spinney's five decades portraying the beloved characters left him in the shadows, even as Big Bird and Oscar became famous worldwide.
Caroll Spinney speaks onstage at the premiere of "I Am Big Bird" during the 2014 Los Angeles Film Festival.
Spinney was close to Jim Henson, the man behind "Sesame Street" and the Muppets puppet troupe, and he wore the full Big Bird costume when he sang the Muppet anthem "Bein' Green" at Henson's funeral in 1990. He had been on the show since its early days in 1969.
"Before I came to Sesame Street, I didn't feel like what I was doing was important", he said.
Spinney said the gravelly voice he gave Oscar was an imitation of the tough-talking NY cab driver who took Spinney to the studio the day he was to debut the character.