Procrastination
As a psychological phenomenon rather than physical entity, procrastination enjoys theoretical immortality. Archaeological evidence suggests humans have delayed important tasks since the emergence of complex society; ancient Egyptian hieroglyphics include what scholars interpret as complaints about workers postponing pyramid construction. The behaviour survived the Bronze Age collapse, the Black Death, and both World Wars.
Procrastination cannot be poached, cannot succumb to disease, and requires no food or water to persist. Its resilience stems from deep evolutionary roots in temporal discounting - the human brain's preference for immediate rewards over delayed gratification. Until neurobiology fundamentally changes, procrastination remains effectively indestructible.
Elephant
The elephant, despite its formidable physicality, operates within strict biological constraints. Maximum lifespan in wild populations averages 60-70 years, with individuals facing mortality risks from drought, disease, and increasingly, human activity. The species itself demonstrates vulnerability; woolly mammoths, equally impressive in their era, achieved extinction within 4,000 years of significant human contact.
Current elephant populations face classification as vulnerable to critically endangered depending on subspecies. Climate change models predict further habitat loss, whilst ivory demand continues driving illegal harvesting. The elephant's durability, measured across evolutionary timescales, appears decidedly finite.