Steven Savile 
Shadow of the Jaguar [EPUB ebook] 

Strange anomalies are ripping holes in the fabric of time, allowing creatures from distant past and far future to roam the modern world. Evolutionary zoologist Nick Cutter and his team must track down and capture these dangerous creatures and try to put them back where they belong. A delirious backpacker crawls out of the dense Peruvian jungle muttering about the impossible things he has seen… A local ranger reports seeing extraordinary animal tracks and bones — fresh ones — that he cannot explain… Cutter and the team are plunged into the hostile environment of the Peruvian rainforest, where they endure a perilous journey towards something more terrifying than they could possibly have imagined…