The Science of Sustainability

With Condors on the Brink, California Considers a Lead-Bullet Ban for Hunters

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Tim Huntington, courtesy the Ventana Wildlife Society

Tim Huntington, courtesy the Ventana Wildlife Society

After teetering on the brink of extinction 30 years ago, the California condor has made a gradual recovery in the state. But scientists say hunters are hampering a full recovery – not because they’re shooting at condors, but because the giant scavenger birds swallow lead bullet fragments when hunters leave an animal carcass behind.

The California legislature is considering a bill that would ban the use of lead bullets in hunting across the state. It would be the first statewide ban in the country and in the midst of a tense national debate over gun rights, the bill, AB 711, is raising controversy.

Slow Progress

The condor’s incremental recovery has taken longer than many expected, demanding substantial resources. “There’s plenty of other species to be focusing on,” said Kelly Sorenson, a biologist with the Ventana Wildlife Society. “But instead we’re entrenched in this very intensive effort to save this species.”

Sorenson is ensconced in a spot along the Pacific Coast Highway, overlooking a large, rotting gray whale carcass, washed up on a beach. The windswept stretch of Big Sur coast is prime condor country.

condor-biobox-1200

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“Oh yeah, from a condor point of view this is a smorgasbord,” Sorenson says. “This is dinner for months.”

Just over the hill, two condors come soaring out of the trees. “This might be a breeding pair,” he says. “They’re both adults, I can tell from here. They have a bright red head.

Condors resemble turkey vultures, but dominate the skies with an imposing nine-foot wingspan. Sorenson scans their wings with binoculars, looking for numbers. “I can almost make it out. It looks like it might be 51.”

There aren’t many condors without numbered tags, because most were born in captivity. Centuries ago, condors ranged from Canada to Texas. But by 1982, under pressure from hunting and habitat loss, only 22 remained. Scientists took them out of the wild in a last-ditch effort to save the species.

“Fortunately they bred very well in captivity and we started reintroducing condors to Big Sur in 1997,” Sorenson says.

It’s been a slow recovery since. Today, there are about 400 condors in California, Arizona and Mexico, including a large portion in captivity. On California’s central coast, just 70 live in the wild. It could be why Sorenson is having trouble shaking what happened the day before we met. His team found one of those condors dead, a male that Sorensen had been tracking for 10 years.

“That’s what makes it especially hard when one of those birds dies,” he says. “But if it’s what it usually is, which is lead poisoning, it makes it even harder to deal with.”

Sorenson’s team traps condors twice a year to test for lead poisoning. If they catch a case in time, the bird is taken to a treatment center in Southern California. Ten condors have already been treated this year.

Condor Forensics

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Click to enlarge

“The problem is really epidemic,” says toxicologist Myra Finkelstein. “These California condors are exposed to chronic harmful levels of lead.”

In her lab at the University of California-Santa Cruz, Finkelstein holds up a vial with a small shard of metal: a lead bullet fragment found in the digestive system of a dead condor.

“This is enough lead to poison and potentially kill a condor,” she says.

As scavengers, condors will feed on any dead animal, including carcasses or partial carcasses left by hunters or ranchers. “They’ll come to eat it and they inadvertently will also ingest these fragments,” Finkelstein says.

Through tests on hundreds of condor blood samples and feathers, Finkelstein’s lab has worked to trace the source of lead. In the majority of cases, she says it matches the chemical profile of lead bullets.

In response, former Governor Arnold Schwarzengger banned the use of lead bullets in hunting in 1997, but only in condor territory. Condors are still showing high levels of lead, which can shut down their digestive system.

“It only takes one meal so that’s why the problem is so severe,” Finkelstein says.

Now, the California legislature is considering taking the ban a step further by banning lead bullets for hunting statewide. Lead ammunition could still be used at shooting ranges.

Casting Doubt

“We don’t know exactly what the source of the soluble lead is,” says Chuck Michel, an attorney for the National Rifle Association. “There are multiple sources of soluble lead in the environment.”

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The NRA and other gun groups have targeted the scientific research, saying the lead could be coming from paint or garbage dumps. Hunters could use copper ammunition as an alternative, but it’s often twice as expensive. A box of 20 rounds that costs $25 for lead, goes for around $50 for copper.

“It prices a lot of people out of the market,” says Michel. “If it’s mandatory, there’s really going to be a lot less people that can afford to go hunting.”

That’s why gun groups see the bill as a threat. “This is a way to bring a cultural attack on hunting and sportsmen and women,” he says.

“We heard all the same arguments in the late 80s and early 90s,” says Jennifer Fearing of the Humane Society of the United States, referring to when lead shot was banned in duck-and-goose hunting nationwide.

“It actually restrains very little about activities with guns,” she says. “It just requires that a bullet be made of one metal rather than another.”

Lead was phased out of paint and gasoline decades ago. While AB 711 wouldn’t prohibit the sale of lead bullets, Fearing believes it would still be effective and could help other wildlife that also scavenge, like eagles and hawks.

“It’s just going to take some time, quite frankly, for ranchers and others to switch the ammunition they use on their properties and just for the culture within the hunting community to move to a place where they accept their responsibility,” she says.

The lead ammunition bill has already passed the California Assembly and is now being considered by the state Senate, where its chances look favorable.

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Category: Biodiversity, Radio

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About the Author ()

Lauren is a radio reporter covering environment, water, and energy for KQED Science. As part of her day job, she has scaled Sierra Nevada peaks, run from charging elephant seals, and desperately tried to get her sea legs - all in pursuit of good radio. Her work has appeared on Marketplace, Living on Earth, and NPR's Morning Edition and All Things Considered. You can find her on Twitter at @lesommer.
  • rhon

    http://www.foxnews.com/us/2013/06/13/intruder-endangered-bird-species-damages-california-community-homes/

    and for another report on the condors this week, see this article, too.

    • foreignthinker

      Love how Fox has characterized less than 33 birds as "terrorizing" and "besieging a town" of over 5,000 people.

  • Josh

    So… why isn't the lead exposure the highest during hunting season, then?

    • wherecanigetsomeobjectivity

      Also important is why hasn't there been any improvement in lead poisoning levels since the lead ban in the condor range started? I know scientists matched the lead isotopes in the condors to the isotopes in lead bullets, but no one has ever been able to show me all other sources of lead were eliminated. Meaning if bullets use isotope XYZ, do any other items of lead use isotope XYZ? Compliance with the existing lead ban is at 99%.

      My fear is that these efforts to expand the lead ban will do little to help condors. Condors are consumers of all types of anthropogenic waste, will an expanded lead ban outside of their range do much?

      • davisfisherben

        Pig hunting in the lead ban area is year round. If you look at the data from other areas that allow lead to be used and do not have pig hunting, there is a strong correlation to deer hunting season and higher lead levels in all scavengers in Arizona. Hunting and depredation hunting leave great food sources for animals, Hunters help them just by leaving a gutpile in the field, as long as that gutpile doesn't have lead in it. Also, it is really easy to identify pieces of lead bullets and lead shot in x-rays taken of dead condors that have died from lead poisoning. While the fragments often pass before the bird dies, many times it does not and they can be recovered.

        The study says that hunters reported using non-lead 99% of the time, BUT, that only means that hunters told the uniformed DFG employees that they were using it, it doesn't mean that they were.

        check http://huntingwithnonlead.org/ for more info.

  • Beyond Searsville Dam

    Great article Lindsey!

    We hope Stanford University will recognize the many benefits they would enjoy with removing their antiquated and destructive dam, just as owners of San Clemente Dam are now.

    Nice work!

    Beyond Searsville Dam

    http://www.BeyondSearsvilleDam.org

  • http://Quest mike

    It is really interesting that environmentalist are now saying 'lead bullets' are killing Condors, and want lead based ammunition banned. Was it not long ago that these same environmentalist were carping about the electrical generating 'windmills' killing endangered species? Did California ban those generators?

    What this is all about is banning ammunition that is used in guns that cannot be banned. No bullets, the guns don't work. This is a backdoor ban of guns-flat out.

  • George

    Observing is wiser !