Meet 'Mad Hatterpillar,' the caterpillar that uses its old heads for defense

(CNN)In the dense eucalyptus forests of Australia, deadheads forage leaves and wriggle their bodies around. No, these aren't Grateful Dead fanatics stranded since the psychedelic shows of the 1970s.

Native to Australia, Uraba lugens is a strange caterpillar that stacks its molted heads atop each other. With every molt, the stack becomes an increasingly tall, tapering tower since every head is larger than the last.