Something that has been missing from San Francisco Bay since World War II appears to be making a comeback: Harbor porpoises are showing up in growing numbers, and researchers are trying to understand why they're returning. Bill Keener ... is with Golden Gate Cetacean Research, a nonprofit group focused on studying local porpoises, whales and dolphins. Harbor porpoises, ... feeding in the middle of a busy shipping lane, spin as they go after schools of herring and anchovies. Seeing this behavior is huge for Keener because harbor porpoises are notoriously shy in the open ocean. But the fact that they're here at all is what's most remarkable. Keener and his colleagues have identified 250 porpoises with their photos by looking for unique scars on the animals. The big question, though, is why harbor porpoises disappeared in the first place. Keener says the bay has always been porpoise habitat. Sightings were common until the 1930s. "There were a lot of things going on during World War II that could have caused [the decline]," he says. Water quality has dramatically improved since the 1970s, which may be bringing the porpoises back.
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