To the west of Eruth and the Great Coastal Grasslands lie a few isolated islands, the largest of which is called "The Rumbling Island." The island isn't called that due to volcanic activity or earthquakes (it's not seismically active) but due to one of its largest and most impressive inhabitants: the Titan Quail.

The Titan Quail is a massive flightless bird that evolved from the Earth's common quail. Being able to evolve unbothered by mainland predators and with little competition, it managed to slot itself into the mega fauna niche, taking on traits similar to several herbivores from Earth's past. Its wings developed into powerful, single-digit arms with long, tough quills at the ends for added reach. The quail uses these arms to pull down branches of fruit-bearing trees.

Male Titan Quails have very vibrant heads and necks, meant to attract potential mates. The most striking part of this display is the chest and neck sack, the latter of which works as an inflatable resonator, used to produce very deep, rumbling calls. These calls are what gave the Rumbling Island its name.

At the height of the dry season, during quail's mating season, people must stay clear of these birds, the males in particular. While males mostly focus on providing a visual and auditory performance for the females, their bodies also get flooded with testosterone, making them volatile and dangerous. Even the slightest thing can provoke them into attacking and brutalizing anything unlucky enough to get in their way.

Thankfully, Titan Quails are mostly docile and unbothered by smaller creatures for the rest of the year.