The English noun "auspice," which originally referred to this practice of observing birds to discover omens, also comes from Latin "auspex.".    From Wordnik.com.  [Merriam-Webster's Word of the Day] Reference

No croaking raven turns the auspex pale.    From Wordnik.com.  [The Poetical Works of Oliver Wendell Holmes — Volume 10: Before the Curfew] Reference

"Auspicious" comes from Latin "auspex," which literally means "bird seer".    From Wordnik.com.  [Merriam-Webster's Word of the Day] Reference