The Alarm Clock Bird is a character that appeared in "Thank You." It is much like an alarm clock for the Snow Golem. In the morning it squawks, making a the beeping buzz of an alarm clock. It is crushed by the Snow Golem when it makes a sound in the beginning of the episode, but it flies away apparently unharmed. Later in the episode, it is burned by the Fire Wolf Cub and flies away (though featherless). It is unknown whether he is still the Snow Golem's alarm.
Baby Birds in Storytelling
Baby Birds appear in "Storytelling." They are sitting in a nest when Finn considers threatening them with a big rock, trying to create "suspense" for his story. While Finn is thinking about threatening the birds they are apparently unaware of him. Finn imagines that when he threatens them, they suffer panic attacks and die. When the mother bird comes and is worried about where her baby boys went, Finn realizes he can't threaten the baby birds. Outside his imagination, the birds fly away when he throws the rock to the floor. The baby birds might have been the same birds from the episode "To Cut a Woman's Hair," the mother bird Finn imagines looks similar to Mrs. Yoder without the bandage on her beak.
Baby Birds in To Cut a Woman's Hair
Finn feeds Baby Birds chewed-up apple out of his mouth since their mother, Mrs. Yoder, had a bandaged beak.
Bird in Evicted!
This Bird is a character that appears in the "House Hunting Song." It is one of many characters that Finn and Jake encounter while searching for a new home. Finn stuck his foot in the Bird's birdhouse. It became angry and threw worms at Finn and Jake.
The Blue Bird is a character who appears in "Jake vs. Me-Mow." When Jake was about to push Wildberry Princess off the cliff, the Blue Bird noticed the sausage in Jake's ear and tried to eat it but instead knocked Me-Mow out of Jake's nose. It is the Blue Bird that ultimately saves Jake's life (though unintentionally), as Me-Mow had threatened to stab him in the brain if he told anyone of the poison. Getting Me-Mow out of Jake's nose is what created the complications giving Jake the idea to enlarge his liver. At the end of the episode, Me-Mow is seen riding the bird.
The Brown Owl is a minor character who appears in "Memories of Boom Boom Mountain." He is seen among the group of animals having a tea party with Jake.
Brown Bird appears in the episode "Hot to the Touch" where his wings get set on fire by Flame Princess and flies away. He has an accent and uses improper grammar in saying "Don't you judge me! It was that fire chick down there that done this to me!" Most of his body was brown and his beak and legs are a brick color. He was voiced by Cole Sanchez.
The Candy Owl appears in the episode "What Have You Done?." It's seen flying in the dungeon where Finn and Jake hold Ice King as a prisoner. It resembles a normal owl, but it appears to have jelly beans and sprinkles on its back. Its eyes are a deep purple and shiny.
Chickens first appeared in the episode "Donny," when Donny stuffed a chicken in a mailbox saying that it was being sent "eggspress." He later squeezes a chicken, making it shoot eggs at the House People. The egg-shooting chicken was a rental from the farmer. A gray chicken also appears in the left hand of the Royal Tart Toter, and also a chicken appeared in "Five More Short Graybles," where Jake makes it go away.
Duck in Conquest of Cuteness
A duck appeared in "Conquest of Cuteness" when Finn and Jake called together a couple of their friends. Character designer Andy Ristaino has confirmed that this duck is not Boobafina.
Duck in The Eyes
One duck appears in "The Eyes" which Finn and Jake fed and sometimes hang out with.
Giant Duck is a character that appears in the "House Hunting Song." It is seen when Finn and Jake try to make a house out of it by laying sticks along its side to make walls and a window frame. It then realizes that two strangers are sitting next to his hindquarters, and begins moving around scare them off. The duck has the appearance of an enormous stone from behind.
Family of Ducks
A family of ducks appear in "The Duke" when the Duke of Nuts helps them across a puddle by laying his cape over it. The ducks' appearance matches the area's "nut" theme. The adult has a peanut-shell pattern on its stomach, and a leaf as a tail. The ducklings are shaped like a cashew, with a seam down the center of their bodies, and a leaf on their heads.
They are small and have a simple round body. Their wings are long, and tails are triangular. Their beaks are orange.
The Vultures appeared in the episode, "Thank You." Three vultures tried to eat the Fire Wolf Cub. The Snow Golem then yells and scares them away. They have hunched backs and black feathers. Their head and necks are bald. They have white feathers around their neck. In general, they look like normal vultures. One also appears in "Gotcha," and appears to take a liking to Lumpy Space Princess and Turtle Princess. Lumpy Space Princess named him, "Billy."
Xergiok's large birds appear in "The Great Bird Man." When fully grown, they are large enough to ride, and have large, lumpy noses. Xergiok appears to name most of them after sweet treats, such as Taffy. They seem to be more mammal-like, as they don't have beaks, and have their young breastfed.
Giant purple bird
A giant purple bird kidnapped BMO after it preformed the dance move, "The Worm," in "BMO Lost." The bird tried to feed BMO to its babies, but, fortunately BMO escaped.