On a recent sunny day, Kaiser checked on a feral hive he put on a resident's roof last fall. Dressed in a full-body white bee suit and a zippered hood with a mesh face mask, Kaiser carefully opened the hive as bees buzzed around him and traffic whizzed by two stories below.
When he was done, about a dozen agitated bees followed him from the roof, down a ladder and into the residents' house before they gave up the chase.
"There are people who think we're crazy for what we're doing," said Kaiser, who has been keeping bees for three years. "But they're afraid that new beekeepers dealing with feral hives are going to tarnish the image of the established beekeepers."
Those more traditional beekeepers keep European honeybees, which rarely become aggressive.
Groups like the Beekeepers Association of Southern California support urban beekeeping, they say, but only with European hives.
Keeping Africanized hives "gives beekeepers in general a bad name," said Richard Heryford, vice president of the association and beekeeper. "If people are caught with those bees in their backyard, they should be subject to penalties."