Animals have played important roles in the storyline of Lost.
|Animal||Image||Appearance and Role|
Main article: Birds
Main article: Cats
Main article: Cattle
Main article: Medusa Spider
Main article: Moths
Main article: Polar Bears
In a baby-themed music video that Drive Shaft is shooting, there are stuffed polar bears in the crib. (Fire + Water) Michael gives young Walt a stuffed animal polar bear on his last meeting with him before he gave up custody.
Main article: Rabbits
Main article: Sea urchin
Main article: Sharks
Main article: Frog
Main article: Wild Boar
- Locke said that when his foster sister Jeannie died, a Golden Retriever appeared which their mother believed was her daughter reincarnated. It stayed for five years, until the woman died, then disappeared. ("Outlaws")
- Fish are depicted in the Mural. ("Man of Science, Man of Faith")
- Fish are regularly eaten by the survivors, as well as Jacob. ("The Incident, Part 1")
- Animal-themed decorations are featured in The Staff's nursery, including a lion, zebra, and monkey. ("Maternity Leave")
- Mr. Eko told a story about a boy who kills a dog, then worries about the existence of hell not because he is sorry, but because he is worried the dog he killed will be waiting for him there. ("Three Minutes")
- Jack was shown the cartoon The Blue Danube, which features animals based on the folk tale "The Ugly Duckling". ("Every Man for Himself")
- Juliet managed to impregnate a male field mouse. ("Not in Portland")
- Pictures of orange fish and insects including a bee are featured in the Room 23 video. ("Not in Portland")
- Ben has an insect collection in his home. ("One of Us")
- A hamster is seen being held by a mysterious woman in Ben's painting at his house at the Barracks.
- According to the commentary on the "On location" section of the Season 3 DVD, the tank in the Hydra Station where Jack was being kept prisoner, was used also for sharks and the dolphins that Juliet told Jack about in "A Tale of Two Cities". A dolphin is also seen in a child's drawing on one of the walls in the school. The dolphin in the picture is swimming with an unidentified girl in a pink swimsuit, along with some smaller fish, and the submarine. The picture is labeled, "Me and my fish".
- There is a stuffed orca in Claire's purse in "What Kate Does", the same stuffed orca that Aaron was clutching in "Something Nice Back Home".
- In ancient times, a sea turtle is seen on the beach near young Jacob and the Boy in Black. ("Across the Sea")
- Several large sea turtles can be seen on the daytime beach shots of "There's No Place Like Home, Part 1"