Heidelberg, Germany: A water frog in a botanical garden. The species, also called a pond frog, is a cross between the small pond frog and the sea frog. Photo: Ronald Wittek/EPA.
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Heidelberg, Germany: A water frog in a botanical garden. The species, also called a pond frog, is a cross between the small pond frog and the sea frog. Photo: Ronald Wittek/EPA.
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