January 2018 - Last winter, National Park Service biologists observed record high numbers of federally threatened Western Snowy Plovers overwintering at Ocean Beach and Crissy Field in Golden Gate National Recreation Area. In an average survey, they counted about 60 plovers at Ocean Beach, and about seven plovers at Crissy Field. So far, the numbers this season are not quite as high, averaging about 50 plovers per survey at Ocean Beach and 2-3 plovers per survey at Crissy Field. Still, these numbers are significantly higher than average since plover monitoring began in 1994—good news for plovers.
Biologists don’t just count these fluffy shorebirds, they also add colorful bands to their legs for identification purposes. What’s the advantage of banding in addition to the counts? The combination enables long-term tracking of specific individuals as well as the larger population. This provides a more nuanced picture of how the birds are doing. For example, biologists have continued to spot a plover banded with white, silver, and yellow, season after season. It turns out this bird was banded during the Cosco Busan oil spill of 2007, which means that it is at least 10 years old!