Panda
The giant panda presents a curious case study in biological durability. Individual specimens routinely achieve lifespans of 20-30 years in captivity, with the oldest recorded panda, Jia Jia, surviving to age 38. Their robust physiology, evolved for processing low-nutrition bamboo, has proven remarkably resilient once immediate survival threats are mitigated. The species has existed in recognisable form for approximately 8 million years, demonstrating evolutionary staying power that few mammals can claim.
However, this durability operates within narrow parameters. Pandas cannot survive outside specific temperature ranges, require access to bamboo forests, and reproduce with notorious reluctance. Their continued existence demands continuous human intervention at extraordinary expense.