RIO GRANDE VALLEY, Texas (ValleyCentral) — Slithering slowly across the bone-dry South Texas sendero glides an exceptionally large western diamondback rattlesnake. Flicking forked tongue, tasting air for scent, the imposing rattler silently slides with powerful, mesmerizing movement. Muscles flexing and contracting in serpentine symphony, the enormous snake moves with concentrated fluidity, always carrying rattles high, and then begins vanishing into cloaking chaparral. It will take a while for a snake this [...]