You can use 
map $_->{humps}, values %$animals;

[download]
If your structure becomes even more complicated (e.g. different level of nesting), you should use recursion (or CPAN).
لսႽ† ᥲᥒ⚪⟊Ⴙᘓᖇ Ꮅᘓᖇ⎱ Ⴙᥲ𝇋ƙᘓᖇ

In reply to Re^3: Extracting values from nested hashrefs by choroba
in thread Extracting values from nested hashrefs by loris

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