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Carcharhinus leucas, the bull shark, or cub shark, is a member of a large family, the Carcharhinidae, sometimes called requiem sharks. It is of medium size, reaching a maximum of a little more than three meters in some parts of its range, but little more than two and one-half meters in my study area. It is euryhaline, able to live for extended periods of time in both freshwater and marine environments. It is a viviparous shark, retaining the young and nourishing them by means of a yolk-sac placenta.