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At least twice a week during the summer, volunteer Karen Mason visits St. Pete Beach to deter beach-goers from entering fragile nesting sites. When she’s not busy shooing away dogs or educating vacationers about the importance of��sharing the shore, Mason��enjoys snapping photographs of the��Black Skimmers��she works to protect.��

But last month, while photographing her big-billed subjects, Mason��captured an adult Skimmer��feeding its chick something that didn’t��look like a fish—or anything else she recognized.��Later, after she got home and blew up the��photo to��reveal the mysterious object, she couldn't believe what she saw: The chick was holding a��cigarette butt.��

Mason says she didn't see if the��chick ate the butt,��but��just the sight��of the baby bird with a��filter��in its beak was��enough to anger her.��“There’s no excuse for it,” she says. “I don't know if people don’t realize how toxic cigarette butts are or that they’re not really biodegradable, but it just really upset me.”��

Each year, trillions of cigarette filters end up as��litter worldwide.��The chemical-laden butts��are made of a plastic called��cellulose acetate��and consistently in trash removed during environmental cleanups. But those efforts, as important��as they are, don't even come close to��solving��the problem. “That's a drop in the bucket,” ���������, CEO of the Cigarette Pollution Project, a nonprofit made up of various public health and environmental groups.��

From roadsides to remote hiking trails,��cigarette butts are ubiquitous. In��urban areas, where they are��mindlessly��tossed aside on sidewalks and streets,��butts are an especially pervasive problem. And when it rains,��they can flow with runoff down storm drains and out into waterways and the��open��ocean. Eventually many of these butts end up on beaches,��where seabirds and shorebirds might��mistake them for food, just as they do with plastics.����

Studies have shown cigarette butts to��have negative impacts on a variety of animals,��but so far there's been little research on whether wild birds eat discarded filters or if they are��poisoned by them. The scant��evidence that does exist points to a high likelihood on both fronts.��Pet birds, for example,��have been known to eat butts out of their owners’ ashtrays, and the results are dire.��, a veterinarian at Niles Animal Hospital and Bird Medical Center in Illinois, once examined an African Gray Parrot that died from organ failure due to chemical poisoning after��eating used filters.��“I always tell people to keep birds away from cigarette butts,” Sakas says, “because it could happen.”

The likely consumption of cigarette butts isn't just limited to shorebirds. Any generalist��species with an indiscriminate��diet could wind up with filters for food. What's worse, the addition of��flavored tobacco products may attract birds with their fruity smells, says Novotny, who the environmental impacts of tobacco as a professor at San��Diego State University.��

Even when they don’t cause death in wildlife, eating cigarette butts can lead to nausea, vomiting, and seizures, Novotny says.��Birds might be at a greater risk��because their small size and fast metabolism means they absorb nicotine and other chemicals faster, requiring��

Simply being in contact with the butts could also pose issues for birds. House Sparrows and House Finches have learned to adapt to the��littered landscape, incorporating filters into their nests to help��. But research shows that handling the toxin-concentrated fibers with their beaks likely causes , which could lead to cancer in longer-lived birds.��

Cigarette butts aren't just a hazard for hungry animals: They can also end up in the mouths of toddlers. And while filters reduce the amount of tar in cigarette smoke, research shows they make it easier to take deep drags and draw carcinogenic particles further into the lungs. This gives smokers a false sense of protection, even though the rise of cigarette filters coincides with a rise in an aggressive form of called adenocarcinoma.����

Because of their status as��both a public health and environmental concern,��there has been to��outright ban��cigarette butts.��Most recently, California State Senator Hannah-Beth Jackson a bill to��ban single-use filters in the state. In response to the increasing pressure, tobacco companies have started looking into . Previous attempts to create eco-friendly��filters have sputtered, though, and these��solutions still ignore the public health issues.

In the meantime, evidence like Mason's Black Skimmer photograph can convince individuals to take action against cigarette butt pollution. Since her��picture went viral, people have dedicated beach cleanups to the chick and told Mason that they would be more mindful of where they put their smoking byproducts. "It's not going to be everybody," Mason says, "but��every little bit helps."

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