Panda
In captivity, giant pandas achieve lifespans of 25 to 30 years, with the oldest recorded individual reaching 38 years. Wild pandas fare somewhat less well, with estimates suggesting 15 to 20 years as typical, assuming successful navigation of habitat fragmentation, dietary limitations, and the species' general disinclination toward activities that might ensure survival.
The panda's lifespan must be contextualised against its reproductive output. Female pandas are fertile for approximately 24 to 72 hours annually. The combination of limited fertility windows, male disinterest, and cub mortality rates approaching 40% means that panda longevity contributes less to population sustainability than one might hope. Each panda lives a reasonably long life; the species simply produces too few of them to matter.
Owl
VERDICT
The mathematics admit no ambiguity. Parrots routinely achieve lifespans two to three times that of pandas, and they do so whilst successfully reproducing, a combination the panda has not managed. In longevity terms, the parrot wins by decades, and it will still be winning long after this comparison has been forgotten.