Mammals
Baiji
Lipotes vexillifer · also called Yangtze river dolphin, Chinese river dolphin
An extensive 2006 survey of the entire Yangtze River searched for weeks without finding a single baiji, a river dolphin that had thrived in these waters for millions of years before disappearing within just a few decades of rapid industrialisation, one of the starkest and most sudden mammal losses in modern conservation history.
Overview
The baiji, Lipotes vexillifer, was a freshwater river dolphin historically native exclusively to the Yangtze River system of China, declared functionally extinct following an extensive 2006 survey that failed to locate a single surviving individual. Its remarkably rapid decline within living memory, distinctive upturned beak, and status as one of the most significant documented mammal extinctions in recent decades make it one of the most sobering case studies in modern conservation history.
A species lost within a single lifetime
Unlike extinctions that unfolded over centuries, the baiji’s disappearance happened within just a few human generations, a species that thrived for millions of years vanishing almost entirely alongside the rapid transformation of the river it called home.
Status
Critically Endangered, declared functionally extinct following an extensive 2006 survey, though not formally reclassified as Extinct pending any confirmed evidence of survival.
Baiji: common questions
Is the baiji officially extinct?
The species was declared functionally extinct following an extensive 2006 survey of the entire Yangtze River that failed to locate a single individual, though it has not been formally reclassified as Extinct by conservation authorities pending any confirmed evidence of survival, leaving its exact status a matter of ongoing caution.
What caused the baiji's dramatic decline?
This species declined dramatically over just a few decades as the Yangtze River underwent rapid industrialisation, dam construction, heavy boat traffic, and pollution, a combination of pressures within one of the world's busiest river systems that proved impossible for the species to withstand.
Have there been any confirmed baiji sightings since 2006?
Despite the 2006 survey's failure to find any individuals, occasional unconfirmed sighting reports have continued in the years since, though none have been scientifically verified, leaving the species' true status uncertain rather than definitively confirmed as extinct or surviving.
Why is the baiji's disappearance considered so significant?
This species' disappearance is considered one of the most significant documented mammal extinctions in recent decades, notable for occurring so rapidly and so recently within living memory rather than in the distant past, making it a widely cited case study in modern conservation biology.