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Masters of stealth or speed, using enhanced senses and lethal strategies to hunt, Africa's killers include the incredibly fast cheetah and lions, which while slower, have raw power and ingenious teamwork on their side. The rivers, meanwhile, hold fearsome crocodiles.

On the surface, the black lagoon looks peaceful. But dip beneath and a murky world of twisted mangrove roots and seagrass beds is revealed. A dark realm of freakish killers waiting to unleash bursts of speed. The otherworldy Mantis Shrimp has spears for arms. Eels make lightning fast strikes with their alien jaws. And a Bullshark's stolen meal leads to a feeding frenzy of Blacktip sharks. There's