I am not sure whether map plus double values counts as implicit traversing: 
say for map values %$_, values %$animals;

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Update: simplified.
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re: Extracting values from nested hashrefs by choroba
in thread Extracting values from nested hashrefs by loris

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