in reply to Re^2: Extracting values from nested hashrefs
in thread Extracting values from nested hashrefs

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 Section Seekers of Perl Wisdom