Frog Love

A scientist has discovered the amazing ability of a species of tree frog to change the pitch of its mating call to match the resonant frequency of the tree hole he hangs out in. As NPR's Christopher Joyce reports, this enables the lovelorn frog to give his call maximum volume...and when the air space inside the tree hole changes (as rainwater fills it), he modifies his call to again reach maximum volume. (4:15)

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