So far, you've seen the method arrow syntax:
or the equivalent:
my $beast = "Class"; $beast->method(@args);
which constructs an argument list of:
and attempts to invoke:
However, if Class::method is not found, @Class::ISA is examined (recursively) to locate a package that does indeed contain method, and that subroutine is invoked instead.
Chapter 9 shows how to distinguish the individual animals by giving them associated properties, called instance variables.