A yellow-bellied sea snake spotted off Nuevo Vallarta, Mexico, gave one lucky observer a memorable "lifer" moment — but the striking encounter also highlights a bigger reality unfolding in coastal waters. A Reddit user shared a morning sighting of a yellow-bellied sea snake, or Hydrophis platurus, near Nuevo Vallarta, writing, "Lifer for me … what a cool find this morning!"
Photo Credit: Reddit Yellow-bellied sea snakes are among the only truly…