Something that wasn't mentioned is that mammal::new never gets called for badgers, incorrectly giving badgers cold blood. I presume you want to call it so that all mammals have blood=>'warm' (at least by default).

##############inheritest.pl#######################
#use mammal;

my $object = mammal::badger->new;
print $object->hunt;
print $object->snuffle;

##############################################
package mammal;

sub new
{
        my ($class) = @_;
        my %object = ('blood'=>'warm');
        return bless \%object, $class;   # <-- Added $class
}

sub snuffle
{
        return "Snuffle";
}


##############################################
package mammal::badger;
use vars qw(@ISA);
BEGIN { @ISA = qw(mammal); }     # <-- Solution to the asked question

sub new
{
        my ($class) = @_;
        my $self = $class->SUPER::new();  # <-- Base class creates obj
        $self->{'stripes'} = 'true';      # <-- Add badger specifics
        return $self;;
}

sub hunt
{
        return "for worms";
}

##############################################
1;
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