Daniel Seagren is a puppeteer and trained dancer who worked for Jim Henson from 1968 into the early 1970s. Seagren performed background characters in The Frog Prince, The Great Santa Claus Switch (playing Cigar Box Frackle, the proto-Gonzo), and The Muppet Musicians of Bremen.
Seagren performed Big Bird on The Ed Sullivan Show, and filled in as the Bird on Sesame Street for Episode 0083 when Caroll Spinney was sick. As Big Bird, he and the human cast toured around America, in promotion of the second season.
- Sesame Street Pitch Reel
- The Tonight Show (September 26, 1969)
- Sesame Street: Big Bird (Episode 0083), Harold Happy (puppetry only), assisting and minor roles in Season 1
- The Ed Sullivan Show: Big Bird
- The Muppets Make Puppets
- The Great Santa Claus Switch: Skippity, Gloat, Snarl
- The Frog Prince
- The Muppet Musicians of Bremen