• A swarm of bees harassed Charlie, Jack, and Kate. ("House of the Rising Sun")

• Chickens. ("The Other 48 Days") ("A Tale of Two Cities") ("The Man from Tallahassee") and other episodes
• Doves. ("Fire + Water") ("A Tale of Two Cities") ("The Brig") and other episodes
• Gulls. ("Par Avion")
• Hurley Bird. ("Exodus, Part 2") ("Live Together, Die Alone, Part 1")
• The Room 23 birds were found dead outside when Walt was in Room 23. ("Room 23")
• Walt's bird hit a window in Australia. ("Special")

• Amira owns a cat. ("Enter 77")
• Mikhail owns a cat named Nadia, after the gymnast Nadia Comaneci, with whom he shares a birthday. ("Enter 77")

• Sayid sees a cow outside the Flame. ("Enter 77")
• Frank sees a cow on a grassy mound after the helicopter crash. ("Confirmed Dead")

Disambiguation page: Dog

• Bpo Bpo was Sun's dog. ("House of the Rising Sun") ("The Whole Truth")
• Vincent was Walt's dog. ("Pilot, Part 1") ("Tabula Rasa") ("Walkabout") and other episodes
• In Jacob's cabin, there is a painting of a dog. ("The Man Behind the Curtain")
• See main article for a full list of dogs in Lost

Disambiguation page: Horse

• Kate sees a horse in the jungle, which is remarkably similar to one she came across in a flashback. ("What Kate Did")
• Bea Klugh rode to the Flame on a horse. ("Enter 77")
• The Bedouins in Tunisia each ride a horse, one of which is commandeered by Ben after he has defeated the men. ("The Shape of Things to Come")
• Charles Widmore rides a horse into the Others' camp ("Dead Is Dead")
• Richard rides a horse between his home and that of the doctor's on Tenerife. ("Ab Aeterno")

• Arzt collects medusa spiders. ("Exposé")("Tropical Depression")
• Paulo, and then Nikki, are bitten by medusa spiders, causing paralysis. ("Exposé")

• Locke compares Charlie's journey to quit his drug habit to a moth breaking free of its cocoon. ("The Moth")
• Charlie sees a moth during the cave-in, which leads him to find the way out. ("The Moth")

• Sawyer shoots a polar bear in the jungle. ("Pilot, Part 1")
• A polar bear attacks Walt; it is wounded by Michael. ("Special")
• When Sawyer acquires a fish biscuit from the contraption in his cage at the Hydra, Tom says that "it only took the bears two hours". ("A Tale of Two Cities")
• In Locke's sweat lodge vision, a polar bear appears. ("Further Instructions")
• Eko is found injured in a polar bear cave. ("Further Instructions")
• Charlotte finds the skeleton of a polar bear in Tunisia ("Confirmed Dead")

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.

• Ben uses a rabbit with the number 8 on its back to demonstrate to Sawyer how excess stress can cause one's pacemaker to explode. ("Every Man for Himself")
• As a child, Ben uses a rabbit to test whether the Sonic fence is still operational. ("The Man Behind the Curtain").
• In the orientation film for the Orchid station, "Edgar Halliwax" demonstrates how the unique properties of the Island can be harnessed to transport a bunny with the number 15 on its back. ("There's No Place Like Home, Part 2")

• Numerous sea urchins are featured in Lost. ("Pilot, Part 2") ("Hearts and Minds") ("Do No Harm") and other episodes

• A shark threatens Michael and Sawyer on the remains of the raft; Michael shoots and kills it. ("Adrift")
• Sharks were experimented on by the DHARMA Initiative in the Hydra. ("A Tale of Two Cities")
• A DHARMA shark was seen swimming around the submerged island in the flash-sideways timeline. ("LA X, Part 1")

• Sawyer is awoken one morning by the irritating cries of a frog, and searches the jungle, looking for it. ("One of Them")

• It is inaccurately referred to on the show as a "tree frog."

• Locke decides that the best way to procure food is to hunt boar, and leads Kate and Michael on a mission to find one. ("Walkabout")
• Sawyer's tent is ransacked by a boar, and Sawyer believes that the animal has a vendetta against him. ("Outlaws")
• Charlie and Locke come across a dead boar while looking for Eko. ("Further Instructions")
• Miles finds a dead boar in the jungle. ("The Lie")
• Locke brings a dead boar to the Others before his errand with Richard. ("The Incident, Part 1")
• Richard sees a boar while he is trapped in chains on the Black Rock ("Ab Aeterno")
• Young Jacob and his brother are hunting a boar in the jungle. ("Across the Sea")