Seagulls are everywhere in the Bay Area — flocking to Giant's games in San Francisco and crowding South Bay salt ponds. But are they actually native? Once seasonal visitors from Mono Lake, they've recently become year-round residents. We get to the bottom of this gull invasion.

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This story was reported by Pauline Bartolone. Bay Curious is made by Katrina Schwartz, Gabriela Glueck and Christopher Beale. Additional support from Olivia Allen-Price, Jen Chien, Katie Sprenger, Maha Sanad, Alana Walker, Ethan Toven-Lindsey and everyone on Team KQED.