This is a list of all miscellaneous fauna that inhabit Amphibia.
Amphibia is host to larger variants of animals found on Earth, including the eponymous amphibians. Despite this, some arthropods have appeared Earth-sized in almost every episode.
Arachnida (spiders and scorpions)
A few large and small centipedes have appeared, such as in "Family Fishing Trip".
A few minor millipedes have appeared.
Several insects, large and small, inhabit Amphibia.
Blattodea (cockroaches and termites)
Although rarely appearing, cockroaches are most notably featured as the subject of Cockroach Racing in the Bizarre Bazaar.
Several beetles have appeared; including fireflies and ladybirds. Sadie Croaker uses a ladybug as her vehicle. An animal is a beetle if they have an elytron (a thick wing covering).
Several earwigs have appeared, usually in various kitchens and stands as foodstuff.
Several fly and fly-like insects have appeared. Amphibian flies have appearances analogous to birds and other animals.
Hemiptera (true bugs)
Several non-background hemipterans have appeared, including the water strider.
Hymenoptera (bees, wasps, and ants)
Lepidoptera (butterflies and moths)
Several mantises have appeared in the series, undoubtedly most notably in "Anne or Beast?"
Odonata (dragonflies and damselflies)
Odonatans appear frequently throughout the series, likely due to the connections often made between dragonflies and ponds, in which amphibians like frogs inhabit.
Orthoptera (crickets and grasshoppers)
Chordata (amphibians, birds, mammals, reptiles)
Amphibia (frogs, toads, newts)
Main article: Amphibians
Birds are classified by their wings, feathers, and reproduction via eggs. Like many real-life species in Amphibia, most species of bird are massive compared to their natural size, particularly those who naturally prey on frogs like heron and peacocks. Some birds from Earth's own mythologies live in Amphibia, such as the roc, though other unique species like the Love Doves exist. Interestingly, the giant rooster seen in the theme song has serrated teeth and narrow sclera, traits common to reptiles, perhaps referencing the common ancestry among the two classes.
Few mammals live in Amphibia, although those that do are members of the smaller species of mammal, such as Erinaceidae (hedgehogs) and Mustelidae (weasels). In addition, several arthropod species in Amphibia either serve as an analog to mammalian species or are hybridized with mammals, such as the Scorpileo. Though not confirmed to be one truly, Harold the Mole's appendages resemble the star-nosed mole.
Reptiles are classified by scales, cold blood, and reproduction via soft-shelled eggs. In Amphibia, reptiles are among the larger wildlife. Species of squamates (e.g. lizards and snakes), crocodilians (e.g. alligators), and testudines (e.g. turtles) have appeared thus far.
Gastropoda (slugs and snails)
Several slugs and snails have been featured, most notably Bessie.
Other animal orders have been seen or mentioned, such as fleas, silverfish, lice, etc.