Durability
Wolverine Wins
Penguin
The emperor penguin endures temperatures plummeting to minus sixty degrees Celsius whilst standing motionless for months during the Antarctic winter. Their specialised feathers, numbering approximately one hundred per square centimetre, create an insulation system so effective that snow falling upon a huddling colony fails to melt. They survive four months of complete darkness, hurricane-force winds exceeding two hundred kilometres per hour, and the absence of food whilst incubating eggs upon their feet. This is durability measured not in combat prowess but in the capacity to simply persist when every physical force conspires toward extinction.
Wolverine
The wolverine possesses a physiology seemingly designed for indestructibility. Its loose, remarkably tough hide allows it to twist within its own skin to counterattack when seized by predators. Documented accounts describe wolverines surviving wolf pack attacks, driving grizzly bears from kills, and traversing mountain ranges in single nights across terrain that would exhaust larger predators. Their dense fur resists frost formation even in the coldest conditions, and their metabolism permits them to consume frozen carrion that would prove indigestible to other carnivores. They have been known to kill prey ten times their body weight.
VERDICT
Combines environmental resilience with active combat durability that permits confrontation with far larger adversaries