Size Comparison: Human and Common hydra

On this page you compare the exact size of Human with that of Common hydra (also known as Swiftwater hydra, White hydra, Hydra vulgaris) true to scale.

How big is Common hydra?

Learn the true proportions and dimensions. Here, Common hydra reaches a size of approx. 0.59 in. With our interactive tool you can place Common hydra directly next to Human to get a perfect feel for the actual size.

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