Harbingers 3 - The Sentinels (Harbingers)

Andi, Professor McKinney's brilliant-but-geeky assistant, begins to have troubling dreams of thousands of animals around the world mysteriously dying. What could it mean? When her dreams become a reality, Andi discovers a pattern in the mass deaths. But her theory doesn't bode well for humankind--and the team could soon face an even greater disaster.