Panda
The giant panda represents what biologists diplomatically term an evolutionary cul-de-sac. A carnivore that abandoned meat for bamboo, it must consume 12 to 38 kilograms of vegetation daily merely to survive, extracting only 17 percent of available nutrients. Female pandas experience oestrus for approximately 24 to 72 hours annually, during which successful mating remains far from guaranteed. Even when conception occurs, the implantation may be delayed for months, and the resulting offspring—weighing just 100 grams—faces extraordinarily high infant mortality rates.
The panda's entire existence appears to be a case study in biological inefficiency, requiring vast bamboo forests, intensive human management, and remarkable good fortune merely to maintain population stability.