Rubber Duck
The modern rubber duck - typically constructed from polyvinyl chloride or similar polymers - demonstrates remarkable resilience against its primary environmental challenges. Water immersion, the duck's natural habitat, causes no degradation whatsoever. Temperature fluctuations within normal bathwater parameters (thirty-seven to forty-two degrees Celsius) pose no threat. The specimen can be dropped, squeezed, and subjected to considerable infant-related stress without structural failure. More impressively, rubber ducks have survived oceanic voyages of twenty-eight thousand kilometres, as demonstrated by the famous 1992 Pacific cargo spill, emerging years later in functional condition.
King Kong
King Kong's durability, whilst impressive in biological terms, reveals significant vulnerabilities upon examination. The great ape has been felled by biplanes, subdued by chloroform gas, and rendered unconscious by various sedatives. His organic structure, whilst capable of absorbing remarkable punishment from rival kaiju, remains fundamentally mortal flesh. Bullets, whilst ineffective in small numbers, demonstrate cumulative damage potential. Kong ages, tires, and eventually succumbs to injury. No rubber duck has ever been brought down by military aircraft, primarily because no military has ever considered the attempt worthwhile.