Zoo by James Patterson and Michael Ledwidge

Once in a lifetime, a writer puts it all together. This is James Patterson's best book ever.

Total
For 36 years, James Patterson has written unputdownable, pulse-racing novels. Now, he has written a book that surpasses all of them. ZOO is the thriller he was born to write.

World
All over the world, brutal attacks are crippling entire cities. Jackson Oz, a young biologist, watches the escalating events with an increasing sense of dread. When he witnesses a coordinated lion ambush in Africa, the enormity of the violence to come becomes terrifyingly clear.

Destruction
With the help of ecologist Chloe Tousignant, Oz races to warn world leaders before it's too late. The attacks are growing in ferocity, cunning, and planning, and soon there will be no place left for humans to hide.
 
- Goodreads Summary