The bird that vanished overnight: solving a century-old extinction mystery
In short: Until about a hundred years ago, the United States was home to a vibrant, yellowish-green parrot with a bright orange face. Today, it is gone. New genetic analysis of a single remaining specimen is finally revealing whether this bird faded away slowly or was wiped out by a sudden human blow.
The Carolina parakeet was once a ubiquitous sight across the southeastern United States, inhabiting regions ranging from Lake Erie to the Gulf of Mexico. However, by the turn of the 20th century, the species had vanished. For decades, scientists debated the mechanics of its disappearance: was it a slow decline caused by habitat loss and disease, or a rapid collapse triggered by direct human intervention, such as poaching for the feather trade or the destruction of farmland? Researchers recently achieved a breakthrough by performing the first complete genome sequencing of the Carolina parakeet using a single well-preserved specimen collected by naturalist Marià Masferrer. By analyzing the patterns in the bird's DNA, biologists like Carles Lalueza-Fox can distinguish between different extinction trajectories. The specimen was a stuffed bird with a striking orange face. It arrived in a Spanish village around the turn of the 20th century. This unique bird was the only parrot native to the United States. Its existence was documented by a naturalist who did not realize it was one of the final individuals.
A gradual decline typically leaves a distinct genetic signature of inbreeding, where a shrinking population is forced to mate with close relatives, reducing genetic variation over generations. Surprisingly, the Carolina parakeet's genome showed no such signals of progressive demographic decline. There was no evidence of the genetic 'bottlenecks' that characterize a species slowly sliding toward extinction. Instead, the data suggests the population was stable until it was suddenly severed. This implies that the bird did not slowly wither away due to natural pressures; rather, it was likely killed off abruptly by direct human activities, marking a definitive and rapid end to its existence in North America.
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Sources
- Summary by Intellect · source: North America's Lost Parrot
- Also: Humans Drove the Only Native U.S. Parrot Extinct, Says New DNA Study | Audubon
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