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SciShow
This Parasite Needs To Ruin Three Lives
Why do so many parasites, especially helminths aka flatworms, jump around as many as THREE hosts to complete their life cycle? Why isn't one host good enough for them? We'll find out why parasites evolve complex life cycles that don't...
California Academy of Sciences
Ca Academy of Sciences: Nesting in the City
Each spring, great blue herons return to Golden Gate Park to nest. Catch a glimpse of these beautiful creatures. [1:24]