You are in the forested plains of North America, 280 million years ago.

The heat of the early Permian sun was brutal, turning the Texas mudflats into a cracked, dry landscape. You were scouting near a shallow, brackish pool when you saw a small, crawling form stalking through the stunted calamites.

It was a Seymouria, about two feet long, with a heavy, boxy head and stocky, lizard-like legs. It moved with a slow, deliberate sprawl, quite unlike the salamanders you knew from closer to the water's edge. It paused, turning its head with a slight jerky motion, its eyes focused on a large insect crawling on a fallen log.

It lunges, its movement fast, confident, and completely terrestrial—a reptile’s ambush, not an amphibian’s sluggish strike. It snapped up the insect, chewing with a surprisingly robust jaw before raising its head to sniff the air. Its textured skin looked dry, specialized for this harsh, dry environment.

For a moment, it looked directly at you. You weren’t just watching a creature; you were seeing a threshold. It was neither truly fish nor fully reptile, but both—a creature bridging two worlds in a time of intense environmental change.