 a method in that class ($fishstick-&gt;calories), Perl
first searches there for that method, but if it's not there, it goes
searching in its superclasses, and so on, in a depth-first (or maybe
&quot;height-first&quot; is the word) search. In the above example, it'd first look in
Food::Fish, then Food, then Matter, then Life::Fungus, then Life, then
Chemicals.
<p>
This library, Class::ISA, provides functions that return that list -- the
list (in order) of names of classes Perl would search to find a method,