On a recent Sunday, I joined one of their all-day tours around the island.
At 70 acres, Southeast Farallon Island is the largest of the Farallones, and the only one inhabited by humans. Conservation scientists, mostly from the US Fish and Wildlife Service, have a field research station there, where they stay for months at a time.
But it’s strictly off-limits to everyone else – including us.
We cruise into Fisherman’s Bay, and see hundreds of thousands of breeding seabirds covering the face of the island.
It’s not long before you notice the smell.
“It’s definitely very pungent,” said Michael Pierson, an Oceanic Society naturalist. “It has a high level of ammonia for obvious reasons, right? It’s a lot of guano… kind of like a cat box that hasn’t been changed for a while that maybe has some rotten fish in it as well. ”
The slender, black-and-white birds are called common murres, Pierson said, and during peak breeding season last year, there were about 250,000 of them, according to the island’s researchers, who conduct daily counts.
“They nest in the same exact location every single year,” Pierson said. “So out of 250,000 neighbors, you’re going to find the exact same two neighbors to lay your egg [next to] and raise your chick for the season. ”
And, because the birds lay them on the rocky cliffs, the eggs are shaped like teardrops, “which is helpful for the birds because it causes the egg to just kind of roll in a circle instead of rolling off the cliff,” Pierson said.
From Fisherman’s Bay, the boat circumnavigates the island. Along the way, we’re treated to a close-up look of a tufted puffin, and I spot a group of seals chasing after our boat.
“There’s two different kinds of sounds we’re hearing. One of them is the bark and then another one is more of a roar, kind of a belchy roar, ”Pierson said. “The belchy roar is coming from Steller’s sea lion, where the barking is coming from the California sea lion.”
Our tour group then heads back toward San Francisco, stopping to check gray whales and a mother humpback whale with her calf.
Pierson tells me his favorite part of bringing people out to the Farallones is getting to see them experience it for the first time.
“It’s this mysterious place that they’ve heard of but never been to,” he said. “So when they first get out here and they get to experience it for the first time, it’s always kind of magical just to see the sheer number of birds that are packed in on a hillside, or seals and sea lions that are coating the rocks around the outside. And then you get those really rare sightings where, if you see a great white shark or something like that, then everybody completely loses their minds. ”
For a chance to see puffins, whales or even sharks for yourself, the Oceanic Society leads tours around the island every weekend from April to November, weather permitting.