You are in the forests of Japan, 125 million years ago.

The air in the Early Cretaceous forest was thick, humid, and smelled of wet ferns and pine resin. You knelt behind the massive, moss-covered trunk of a conifer, watching the sunlight splinter through the high canopy. Below you, a shallow river—a lifeline of the ecosystem—gurgled over smooth stones.

A thumping and swishing sound reached you, slow and rhythmic.

Through the hanging ferns stepped a Fukuisaurus. It was smaller than the more famous Iguanodons you had imagined, perhaps only four or five meters long, with a robust body covered in pebbled, greenish-brown skin. Its broad, duck-like beak was currently shearing through a patch of cycad leaves near the water's edge, its beak scraping the tough vegetation easily.

The animal paused, lifting its head. The sunlight caught the distinctive structure of its snout, a rigid, fused skull that meant no sideways chewing—just sheer, powerful crushing. Its intelligent, dark eye scanned the riverbank, not in fear, but with careful alertness. It made a low, guttural soft huffing sound, perhaps communicating with others just out of sight in the dense undergrowth.

For a moment, it stood quadrupedal, but as it reached for a higher branch, it shifted, raising its forelimbs and balancing on two strong legs. The encounter felt intimate, a peaceful glance into a thriving, isolated Japanese island ecosystem 125 million years ago. Without sensing your presence, the Fukuisaurus returned to its meal, a silent guardian of the ancient forest river.