![harbor porpoise surfacing with Golden Gate Bridge in the background](https://www.marinemammalcenter.org/storage/app/uploads/public/7c6/eed/2dd/thumb__635_500_0_0_crop.jpg)
SFGATE: The Secret Sex Lives of Harbor Porpoises Under San Francisco's Golden Gate Bridge
- Behavior
- Natural history
The species has a “funnel of love” below the city's most well-known landmark.
Published in SFGATE: December 7, 2023
Bill Keener’s eyes widened as he peered through his binoculars and spotted the dark, shiny dorsal fins swiftly bobbing along the surface of San Francisco Bay. “There’s three of them coming right at us,” he said.
It was a drizzly Tuesday morning in November, and the Marine Mammal Center field researcher and I had been wandering along the pedestrian walkway on the Golden Gate Bridge for about an hour. Cars whooshed past us as we dodged bicyclists and paused at lookout points, keenly peering over the steel railing toward the murky turquoise water about 200 feet below. We were hoping to catch a glimpse of the species he’s been closely tracking for decades: the harbor porpoise, a shy yet charismatic creature that nearly disappeared from the bay altogether.
Harbor Porpoise Research at The Marine Mammal Center
Harbor porpoises have returned to San Francisco Bay after an absence of approximately 65 years. The Center's Cetacean Field Research Team is conducting a multi-year assessment to document this population’s abundance and distribution, as well as to examine their social behavior and calving success.
{"image":"\/Animals\/Wild\/Harbor porpoise\/cropped-images\/harbor-porpoises-aerial-view-badge-by-marc-webber-c-the-marine-mammal-center-0-88-1280-999-1618509985.jpg","alt":"Harbor porpoises seen from above","title":"Coevolution of Asymmetric and Spiraled Genitalia with Unique Mating Behavior","link_url":"https:\/\/www.marinemammalcenter.org\/publications\/coevolution-of-asymmetric-and-spiraled-genitalia-with-unique-mating-behavior","label":"Research Paper","type":"publication"}
![Harbor porpoises seen from above](https://www.marinemammalcenter.org/storage/app/uploads/public/e87/212/775/thumb__237_185_0_0_crop.jpg)
Coevolution of Asymmetric and Spiraled Genitalia with Unique Mating Behavior
Read More{"image":"\/Animals\/Wild\/Harbor porpoise\/harbor-porpoise-shutterstock-2.jpg","alt":"harbor porpoise","title":"Harbor Porpoises Catching and Handling Large Fish","link_url":"https:\/\/www.marinemammalcenter.org\/publications\/harbor-porpoises-catching-and-handling-large-fish","label":"Research Paper","type":"publication"}
![harbor porpoise](https://www.marinemammalcenter.org/storage/app/uploads/public/4c8/c23/17e/thumb__237_185_0_0_crop.jpg)
{"image":"\/Animals\/Wild\/Harbor porpoise\/cropped-images\/harbor-porpoise-by-bill-keener-c-the-marine-mammal-center-309-73-1207-943-1610670087.jpg","alt":"Harbor porpoise surfacing in the water","title":"The Sex Life of Harbor Porpoises: Lateralized and Aerial Behavior","link_url":"https:\/\/www.marinemammalcenter.org\/publications\/the-sex-life-of-harbor-porpoises-lateralized-and-aerial-behavior","label":"Research Paper","type":"publication"}
![Harbor porpoise surfacing in the water](https://www.marinemammalcenter.org/storage/app/uploads/public/f13/f8a/366/thumb__237_185_0_0_crop.jpg)
{"image":"\/Animals\/Wild\/Harbor porpoise\/cropped-images\/harbor-porpoises-foraging-by-marc-webber-c-the-marine-mammal-center-4-0-1276-996-1618438446.jpg","alt":"harbor porpoises eating a large fish","title":"Prey-Related Suffocation in Harbor Porpoises","link_url":"https:\/\/www.marinemammalcenter.org\/publications\/prey-related-suffocation-in-harbor-porpoises","label":"Research Paper","type":"publication"}
![harbor porpoises eating a large fish](https://www.marinemammalcenter.org/storage/app/uploads/public/4b6/941/a93/thumb__237_185_0_0_crop.jpg)
Yes, I want to save a life!
![](https://www.marinemammalcenter.org/storage/app/uploads/public/f88/81c/668/thumb__370_289_0_0_crop.jpg)
Yes, I want to save a life!
You’ll be giving sick and injured animals the best possible care at the Center’s state-of-the-art hospital. With your gift today, you are giving a patient a second chance at life in the wild.
See Our Latest News
{"image":"\/People\/Action\/Veterinary care\/cropped-images\/f-rw22radiograph-examdr-sophie-whoriskey-l-and-megan-mcginnis-rcredit-heather-stocker-c-the-marine-mammal-centernoaa-permit-18786-03-144-15-1270-992-1721670262.jpg","alt":"Hawaiian monk seal in care at the marine mammal center receiving a radiograph exam","title":"Disney Recognizes Dr. Sophie Whoriskey\u2019s Work at The Marine Mammal Center in Hawaii to Save Monk Seals","link_url":"https:\/\/www.marinemammalcenter.org\/news\/disney-recognizes-dr-sophie-whoriskeys-work-at-the-marine-mammal-center-in-hawaii-to-save-monk-seals","label":"Press Release","date":"2024-07-22 03:30:00"}
![Hawaiian monk seal in care at the marine mammal center receiving a radiograph exam](https://www.marinemammalcenter.org/storage/app/uploads/public/450/fac/baa/thumb__237_185_0_0_crop.jpg)
Disney Recognizes Dr. Sophie Whoriskey’s Work at The Marine Mammal Center in Hawaii to Save Monk Seals
July 22, 2024
Read More{"image":"\/Animals\/Patients\/Hawaiian monk seals\/2024\/B. HMS_R8HA_in treatment at Ke Kai Ola_7.10.24_.jpg","alt":"Hawaiian monk seal in care at the marine mammal center","title":"Endangered Hawaiian Monk Seal R8HA Receiving Life-Saving Care at The Marine Mammal Center After Rescue and Transport from Kaua\u02bbi","link_url":"https:\/\/www.marinemammalcenter.org\/news\/endangered-hawaiian-monk-seal-r8ha-receiving-life-saving-care-at-the-marine-mammal-center-after-rescue-and-transport-from-kauai","label":"Press Release","date":"2024-07-16 05:00:00"}
![Hawaiian monk seal in care at the marine mammal center](https://www.marinemammalcenter.org/storage/app/uploads/public/cf4/946/fd3/thumb__237_185_0_0_crop.jpg)
Endangered Hawaiian Monk Seal R8HA Receiving Life-Saving Care at The Marine Mammal Center After Rescue and Transport from Kauaʻi
July 16, 2024
Read More{"image":"\/Animals\/Wild\/Gray whale\/cropped-images\/gray-whale-golden-gate-bridge-by-darrin-allen-c-the-marine-mammal-center-noaa-permit-26532-628-43-1272-992-1721771368.jpg","alt":"gray whales seen in the San Francisco Bay ","title":"LA Times: Why are Gray Whales and Other Marine Life Visiting San Francisco Bay?","link_url":"https:\/\/www.marinemammalcenter.org\/news\/la-times-why-are-gray-whales-and-other-marine-life-visiting-san-francisco-bay","label":"In the News","date":"2024-07-14 02:00:00"}
![gray whales seen in the San Francisco Bay](https://www.marinemammalcenter.org/storage/app/uploads/public/80e/fc1/ce2/thumb__237_185_0_0_crop.jpg)
LA Times: Why are Gray Whales and Other Marine Life Visiting San Francisco Bay?
July 14, 2024
Read More{"image":"\/Animals\/Generic Image\/cropped-images\/sea lion release conservation technology-159-4-1270-992-1720535809.png","alt":"A California sea lion with a small satellite tracking device on its back runs through the sand. ","title":"Conservation Technology: 5 Innovations In Ocean Health","link_url":"https:\/\/www.marinemammalcenter.org\/news\/conservation-technology-5-innovations-in-ocean-health","label":"News Update","date":"2024-07-09 02:00:00"}
![A California sea lion with a small satellite tracking device on its back runs through the sand.](https://www.marinemammalcenter.org/storage/app/uploads/public/658/4ac/c56/thumb__237_185_0_0_crop.jpg)
natural history
Bill Keener
Harbor Porpoise