After a helium-filled balloon is released, it’s soon out of sight and quickly out of mind. But a new study out of Australia provides additional evidence that we should pay much more attention to balloons, because they can have devastating consequences to marine life.

A team of researchers from the University of Tasmania found that balloons are more deadly when ingested by seabirds than any other kind of plastic debris. An examination of 1,733 dead seabirds found that 32 percent had ingested plastic debris, and while soft plastics such as balloons accounted for only 5 percent of the items ingested, they were responsible for 42 percent of the seabird deaths.

Fragments of balloons composed just 2 percent of all ingested plastic, yet the birds that ingested balloon pieces were 32 times more likely to die than if the bird had ingested a hard plastic like a LEGO brick or lollipop stick.

The researchers said balloons are especially lethal because they can be easily swallowed and squeeze into a bird’s stomach cavity.

“A hard piece of plastic has to be the absolute wrong shape and size to block a region in the birds’ gut, whereas soft rubber items can contort to get stuck,” said Lauren Roman, the leader author of the study, in an interview with an Australian news outlet.

Roman believes that seabirds are attracted to balloons at the surface because their fragments may resemble squid, which the birds commonly eat. Most of the birds she studied were shearwaters and petrels, some of which appear in the offshore waters of southern New England in the summer.

The study was published in March in the journal Scientific Reports.

Citing the potential harm to marine life, the Rhode Island town of New Shoreham (Block Island) banned the sale of balloons earlier this year. Many other communities around the country are also taking steps to reduce the release of balloons because of their deadly impact on wildlife. Clemson University in South Carolina ended its tradition of releasing 10,000 balloons before every home football game, for instance, and a campaign in Virginia aims to discourage the release of balloons during wedding celebrations.

Even The Balloon Council, which represents the balloon industry, advocates for the responsible handling of balloons, including never releasing them into the air.

But the release of balloons is still a significant problem with far-reaching implications, according to local wildlife rehabilitators and birdwatchers.

Geoff Dennis, a bird photographer and resident of Little Compton, walks his dog on several local beaches daily and collects the trash he sees. One day in late May he collected 282 balloons on the beaches he frequents. He said many more were washing ashore as he arrived. Less than two weeks later, he collected another 99 at the same beaches.

At a Fourth of July outdoor concert in Westerly, one birdwatcher in attendance counted 87 balloons released, most of which probably drifted over the ocean and landed in the water.

“I see them everywhere on the coast, and the beaches are especially bad,” said Jan St. Jean of Charlestown, an avid birder who spends much of her time year-round looking for birds along the coast. “I just think balloons are such a needless thing to purchase.”

And it’s not just the balloons themselves that are dangerous to birds and other wildlife. The strings attached to the balloons are a significant entanglement threat that have been responsible for many animal deaths.

Birdwatcher Becca Thornton of Carolina wrote on Facebook this month that she rescued a great blue heron that was entangled in balloon string last year. “It was completely wrapped around his legs and couldn’t move or open his legs at all,” she wrote. “If I didn’t see him, jump in the water and cut the string, he wouldn’t be back visiting me this year.”

Several other local birders and wildlife rehabilitators also noted the related concern of birds becoming entangled in fishing line, which appears to be an ubiquitous problem along the Rhode Island coast as well.

A bill to ban the release of helium balloons in Rhode Island, sponsored by Rep. Susan Donovan, D-Bristol, this past session, would have imposed a $500 fine on violators. The bill was held for further study by the House Judiciary Committee.

“The problem is that no one away from the coast sees the balloon problem, only the plastic bag problem,” Dennis said. “And we know where that bill ended up despite how obvious that problem is.”

Rhode Island resident and author Todd McLeish runs a wildlife blog.