Koopa

A koopa is a formerly extinct species of odd-looking Australopithecus-sized turtle that was native to Montana's and South Dakota's riverbanks during the Late Cretaceous from 76 million years ago to 66 million years ago. It mostly walks on all fours like most species of turtles, but it is unique compared to other turtles because instead of walking quadrupedal all the time, it has special ankles and hip bones similar to ornithopod dinosaurs, allowing this turtle species to lift its own body (including its shell) off the ground, but thanks to its unique features, it can also walk upright on its back legs, which is also achieved due to its shell being lighter. It is an omnivore that feeds on fruits, vegetables, grass, roots, tubers, water plants, worms, insects, crustaceans, small fish, small frogs, and smaller reptiles. It is now found in riverbanks, swamplands, marshes, and cities throughout most of North America after being brought back from extinction through time travel. These turtles were an inspiration for Mario's koopas, but real koopas are not sapient and have just the same amount of intelligence as red-eared sliders, and the real koopas make the similar sounds to African spurred tortoises. They don't wear shoes (unlike Mario's koopas, which have them probably due to the Mario's koopas being cartoony characters), so instead they have four-toed weight-bearing feet which are splayed out so they don't sink into thick mud or other substance. They don't detach from their shells, unlike Mario's koopas and just like real turtles, as they would die if they were seperated from the shells since their shells are part of their bodies. Currently, koopas are flourishing in modern North America as they adapt very well in different habitats, tolerate climate changes and human activities, including city expansions.