In the 19th century, Tricolored Blackbirds were among the most abundant birds in California, numbering between two and three million. But as coastal and Central Valley marshlands vanished and native foraging areas gave way to development, the birds increasingly turned to agricultural fields for nesting. This shift left colonies vulnerable, as harvests often had to begin before chicks had fledged. By 2014, the population had plummeted to just 145,000. And now, if climate change continues unchecked, 60% of this bird's remaining range could be lost.

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