Lion
The lion's durability, while impressive by biological standards, remains constrained by the limitations of organic matter. A lion in peak condition may live 10 to 14 years in the wild, though captive specimens occasionally reach 20 years. During this time, the creature requires constant caloric intake, is vulnerable to disease, parasites, and territorial conflicts with competing males.
The lion's organic construction, whilst magnificently engineered by natural selection, ultimately succumbs to entropy. Teeth wear down, muscles atrophy, and the once-mighty predator becomes prey itself. No lion has survived longer than three decades, a rather modest timespan in the grand scheme of material persistence.