Billed as the last in David Attenborough's series ofLifenature documentaries,Life in Cold Bloodleaves you hoping that proves not to be the case. For once more, as he has done many times in his distinguished career, Attenborough gently--and unobtrusively--delivers an utterly fascinating insight into the world in which we live.Life in Cold Bloodlooks at reptiles and amphibians, bringing into focus a series of creatures very much of all shapes and sizes. Across the episodes that make up the series, the filmmakers delve into the lives and mannerisms of its subjects with some quite stunning camera work, bringing to our screens things that have quite simply never been seen before.  As much as perhaps we shouldn't take for granted the heights that Attenborough's work easily scales,Life in Cold Bloodhappily matches the standards of his earlier series. Often genuinely jaw-dropping, and never less than completely absorbing, the DVD set is rounded off with some equally intriguing bonus features that delve into the complex production of the program itself.  IfLife in Cold Bloodreally does bring theLifeseries to an end, then that's even more reason to cherish it. Regardless, this is an extraordinary series that'll make you look at snakes, frogs, crocodiles, and turtles in very different ways. Unmissable.--Simon Brew