This page contains a list of all creatures known to reside in the world of Shin Sekai Yori.
- Main article: Queerats
Queerats are one of the two dominant species in the series, and are considered to be an inferior race that was raised up by humans from naked mole rats.
- Main article: Karma Demon
Karma Demons were discovered before the fall of the ancient empire, and their name was a common term for severe cases of Hashimoto-Appelbaum syndrome. They are Cantus users who have lost control over their abilities.
- Main article: Fiends
"Fiend" is a term invented in the final years of the ancient civilization to describe those suffering from Raman-Klogius syndrome, also known as "Fox in the Henhouse" syndrome.
- Main article: Tainted Cat
The Tainted Cat species originated from common domesticated cats, but were bred selectively with Cantus to increase their size and intelligence, and thus mutated into Tainted Cats.
- Main article: False Minoshiro
The False Minoshiros are man-made automatons modeled after the Minoshiro, which itself evolved rapidly, due to cantus, from a sea slug species.
- Main article: Subaru
Subaru is the pet dog of Shun Aonuma.
- Main article: Balloon Dog
Balloon Dogs are about the size of a dog, completely black, with a round, big torso.
- Main article: Haythatcher
Haythatchers have red, lidless eyes and scales cover their faces.
- Main article: Tiger Crab
Tiger Crabs are members of the family of carnivorous crabs.
- Main article: Vampire Slug
- Main article: Pouch Cow
Pouch Cows, formerly called cow sac, received its name from the aforementioned pouch it has.
- Main article: Triwing Crow
- Main article: Crimson Wasp
Crimson Wasps are huge wasps in shining red armor.
- Main article: Flytrapper
Flytrappers have existed since the ancient times and are a direct descendant of giant hammerhead flatworms of the planarian family.
- Main article: Glowworm
Glowworms have been dated to exist since ancient times and were found in caves in Australia and New Zealand.
- Main article: Puffer Sparrow
- Main article: Reed Warbler
Reed Warblers have nests that are about seven or eight centimeters in diameter, propped up carefully on thick reeds.
- Main article: Rosary Snake
Rosary Snakes have evolved to eat eggs exclusively, raiding nests and eating all the eggs at once, digesting them later on.