The most aggressive of ocean predators, the bull shark, is notorious for leaving the safety of the deep blue ocean, venturing far up the murky rivers of Africa's coast in search of prey. But lurking in these shadowy places is Africa's deadliest killer - the Nile crocodile. Marine researchers Ryan Johnson and Tess Hempson, are determined to find out the truth about the clashes between the two.
52 min2013YLI 13-VUOTIAILLE
