I particularly like this bit ‘"The porpoises have found a way to not only avoid the ships, but it's also the noise they make," says Keener.’
Harbor porpoises haven't been seen in San Francisco Bay for more than 60 years. But now, they're coming back through the Golden Gate in growing numbers and researchers are trying to understand why they’re returning.
The best place to look for them is 220 feet above the water on the pedestrian walkway across the Golden Gate Bridge. That's where Bill Keener of Golden Gate Cetacean Research photographs them, holding a massive telephoto lens over the side of the railing.
"There's a porpoise right there, coming very, very close," he says pointing. A dark shape appears in the water. It's a harbor porpoise, coming up for air. "And here's a mother and calf coming straight at us."