The embryonic journeys of four remarkable animals are brought to life as they develop, from conception to birth. The shark, whose cannibalistic embryos will eat their own siblings to survive; the emperor penguin, whose egg-bound chicks must battle the coldest weather on the planet; the kangaroo, whose underdeveloped foetus will undergo an exceptionally premature birth; and the parasitic wasp, whose larvae must hijack and exploit the body of another creature.
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