East Catland is the Eastern extension of the supercontinent, most of which is in the arid tropical latitudes. The last continental plate crosses the equator which is almost scorched dead and completely absent of vertebrate life except for some cooler elevations in the mountains. Cats live on the plate that precedes this going Eastwards, the cooler (but still hot and arid) Southernmost plate of South East Catland. The land here is very flat except for a mountainous Northern ridge, the rest dominated by grassland plains and deserts thinly peppered with desert needlegrass. Rivers travel a long way from very distant mountains and dry up for large parts of the year (sometimes the whole year on bad years). During the rainy seasons they flood the flat plains that surround the rivers and spread sediment, giving nourishment to the soil. In the Southmost wetter grasslands that receive more regular rainfall there are a few elderberry shrubs in low density but there are no woodlands or forests. Just endless plains of sun-loving, subtropical grasses that are nearly all descendants of commercial crops. The iconic digitgrasses from the wild savannahs of Earth are also present.

The Sun Cat (Catus flavus) of East Catland is a cat that has evolved to tolerate blistering hot exposure in it's native habitat for short periods of time. With that said they still prefer the active hours of their prey, morning and evening before sunrise and after sunset. They can sometimes be seen strolling from one location to the next at a conservative pace at hours when most other cats would be lounging in shade. They can sleep through the heat also, as in some places they might only have grass for shade. Their fur glistens in the sun, reflecting back some harmful sun radiation from their skin. They are slender and long-legged, able to efficiently bound through long grass while expending less energy than their ancestors. Their long thin frame also loses heat faster than before. Most are light brownish yellow all over but a few subspecies have some faded brown spots on their coat, and some have a white tail tip and white underside countershading.

One of the many hazards a sun cat faces are seasonal, lightning-triggered grassland fires. Miles of flat, monotonous terrain mean that there are often few places to hide. They will all flee an area when they even faintly detect smoke from miles away and once they have discerned the direction of the scent. They are also sensitive to discerning the smell of actively burning fires and old ashes that burned days ago. The latter they greatly distinguish from the former and find enticing. In such situations these predators become scavengers digging up and scavenging animals that died by smoke inhalation but did not burn or were only superficially singed and so remained edible.

The high-endurance Banded Rabbits (Cuniculus balteum) (white band around waist circumference starting from one side around back to the other side, shadowed by a parallel black band) also travel far to escape the faint detection of smoke, but if cornered by the flames will crowd into burrows as a last resort. Many don't survive and become scavenegd meals for the cats later. Banded rabbits have high stamina for travelling over long distances, with longer front and hind legs that lock in position for more efficient bounds with less energy used. They migrate when the land becomes overgrazed or dries out, keeping their use of the land rotational which is both good for them and good for the grasslands. They don't rely on burrows as much to hide from cats except during the breeding season. When the banded rabbit group is not burdened with nursing offspring they collectively spring away with a gait more suspended from the ground than their ancestral domestic rabbits, clearing from an area entirely. Cats usually won't waste energy in pursuit once they've lost closeness to their target and their edge of surprise, but they may camp a one-way burrow if they know there's a cornered rabbit hiding.

Sun cats and banded rabbits are the most visually significant mammals on this part of the supercontinent, but there are also many genera of mice scurrying in the grass or under cover of night. Just a few viviparous lizard species live along the Southern coastline, finding the rest of the continent too hot during the day and too cold at night to be active nocturnally. There are local species of sparrow and also those species with a wider range, migrating by season. Where the land is cool and fertile enough for sparrows on East Catland, there are cats, so sparrows have stayed small and quick to take flight so as to easier escape the cats.

A species of sparrow local to East Catland along it's coast is the Surf-Running Sparrow (Domesticus salocursor), a bird that uses it's long beak and legs to keep from creating resistance against very shallow (less than 10cm deep) water, such as water on delta flats, calm waves lapping against the sand at the beach, or an inner bend of a river, or side-section protected from the current. It is carnivorous, both a scavenger and hunter of invertebrate and vertebrate prey. If they have to get their feathers wet to catch something they take a quick dip in the water, provided it is calm. The oil on their feathers protects them from becoming soaked if they aren't in the water for too long.