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A serial killer is on the loose in Australia, where endangered fairy penguins are found dead with apparent gunshot wounds. Wildlife experts and outraged volunteers launch a full-scale investigation, setting up night patrols to find the killer. But when the death toll rises, animal autopsies and DNA testing are needed to solve the mysterious crime. Then, join the investigation into a truly bizarre case toads are randomly swelling up and exploding at an otherwise tranquil park in Germany.