The San Antonio Zoo is helping save the official state reptile of Texas. Here's how.

BLANCO COUNTY — A crowd of people gathered to watch as the tiny lizards took their first, cautious steps, tentatively testing the sandy soil beneath their feet. The young Texas horned lizards paused for a moment, seeming to pose for the cameras and phones recording their every move, then darted in different directions, disappearing quickly into nearby clumps of grass. Kamryn Richard, a senior conservation technician for the San Antonio Zoo,...