Hillary the Owl was a blue-gray owl who appeared as a guest animal in The Animal Show episode episode 113 in which she told Stinky and Jake about owls and their eye sight.
The puppet was recycled as a nameless owl in "Crab & Snail", where it was interviewed by Rhonda Rat. It was also featured as Timothy the Owl in "Owl & Frog." In "Mouse," the owl puppet was used as Mr. Owl who joined Mrs. Snake and Mrs. Fox in trying to eat Stanley the Mouse.
The puppet used for Hillary was later used as Omar the Owl in the Mopatop's Shop episode "Sea Tree House."
The owl puppet also appeared in Mr. Willowby's Christmas Tree, The Muppets' Wizard of Oz and Sesame Street (with new eyes).