Cat
The domestic cat presents remarkable durability for a biological system. Average lifespan ranges from 12 to 18 years under proper care, with documented cases exceeding 30 years. The cat possesses a sophisticated immune system, self-cleaning capabilities, and the legendary ability to survive falls that would prove fatal to other mammals of similar mass. Its skeletal structure permits extraordinary flexibility, reducing injury risk during daily operations.
Furthermore, cats demonstrate psychological durability, adapting to changed circumstances, loss of companions, and relocated domiciles with eventual equanimity. A well-maintained cat represents a durable long-term asset.
Egg
The egg's durability presents a more complex picture. In its shell-protected state, a refrigerated egg remains viable for three to five weeks. Unrefrigerated but clean, eggs may last two weeks in temperate conditions. However, the egg's protective shell is notoriously fragile—a modest impact results in catastrophic structural failure. Humpty Dumpty's fate was not dramatisation but documentary accuracy.
Once cracked, an egg's useful lifespan reduces to mere hours without temperature control. The egg is essentially a time-limited consumable requiring careful handling throughout its brief existence.