The cuttlefish has the largest brain-to-body ratio of all invertebrates, which explains why its camouflage is so intricate and masterful.
There's more than just one creature lurking in this black lagoon. Here, in this bizarre netherworld between river and ocean, evolution has created a variety of freakish assassins, many of whom strike in the blink of an eye. Witness the fast-paced action in slow motion as our high-speed cameras capture sharp-shooting archerfish, African fish eagles, mantis shrimp, and other killers at work. Cutting-edge CGI details show just how they use their alien jaws, spear-like arms, and color-changing skin as weapons of underwater war.
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