Jenny Wren is a recurring character of the Silly Symphonies. She made her debut in the nursery rhyme-based Who Killed Cock Robin?. She also appeared in Toby Tortoise Returns and made cameos in Mickey's Polo Team and Who Framed Roger Rabbit. She is very flirtatious with other boys, but her one true boyfriend is Cock Robin. She was voiced by Martha Wentworth.
In her debut, a robin named Cock Robin begins to sing and strum his guitar. Jenny walks outside her birdhouse and listens to him and falls in love. When he was shot with an arrow, she was the sole witness. Later she shows up to the trial and sings about Cock Robin in her song "Who Killed Cock Robin?" and tells what she saw. Later when Cupid explains he shot Cock Robin because he fell in love and he is not dead. Later Jenny wakes him up and they kiss while Jenny uses her parasol to cover them up.
When Toby Tortoise is punched out of the ring by Max Hare, Jenny rushes to him and helps him wake up. Later when he is knocked out he has a dream he is a sultan and multiple Jennies are attending to him.