|This page is a part of New Pleistocene, a collaborative project detailing the fauna of the next glacial period.|
Japan has become somewhat larger, due to the sea level dropping. Despite this, Japan's flora and fauna have relatively stayed the same, but due to the introduction of some invasive species, some of many of Japan's aquatic invertebrates have become extinct and the ecosystems changed.
- Japanese raccoons, Procyon japonica, are descendants of raccoons introduced to Japan during the Holocene. They are slightly smaller than their North American cousins, they also have slightly shorter muzzles, legs and tails. They are though mainly differentiated by their coloration, while American raccoons have black markings, Japanese raccoons have dark to light brown markings.
- The okineko, Trefelis hodophilax, is a descendant of feral domestic cats, it is nearly twice the size of a domestic cat. They are primarily tan in coloration, with faded brown spots and stripes painting their bodies. Okinekos are excellent climbers and usually hunt small to medium-sized mammals, such as Sika deer fawn, Japanese raccoons and Japanese minks.
- The tanuki, Nyctereutes procyonoides viverrinus, is still widespread across Japan, they survived for being opportunistic and intelligent. Tanuki compete with the Japanese raccoons for some resources, though in the future this is rare, because Japanese raccoons usually stay in trees and usually are active at different times.
- Forest ponies, Equus nihonba, are descendants of feral horses that survived on islands in Japan and migrated across the rest of Japan, when the islands reconnected with each other. They closely resemble yakutian horses, but only come in a chestnut coloration. Forest ponies have thicker manes than their descendants, that are semi-erect similar to the heck horse.
- The Japanese wolf, Canis lupus cabiris, is a descendant of feral dogs that reestablished themselves in the wild, their main prey are forest ponies, island giant deer and sika deer. They have longer legs and muzzles, like wild gray wolves, but the main difference between other gray wolves, is that these wolves are still primarily omnivores.