People looking forward to a swim in the pool at the Kailua District Park are facing a locked gate and a sign saying, "Closed due to duck feces."
"I never heard of such a thing. I know I heard of chicken poop, but not duck," said swimmer Jane Hurtle.
She comes to the pool every week. Hurtle says ducks do hang out around the park and nearby places like Hamakua Marsh, but she's never seen one fly in.
The city says this is the first time the pool has been closed due to a duck poop problem. But, last Saturday, a large flock of ducks flew to the pool and took a dip. When the ducks flew away, they left their calling cards.
The fowl apparently had so much fun, they showed up every day since until Thursday.
"I come for exercise. Water exercise. I miss it very much, but well, I guess I have to wait until it opens up," said swimmer Ted Malmors.
The Centers for Disease Control says many types of birds are attracted to swimming pools. Their droppings contain bacteria that could be harmful to humans.
"There's chlorine in the pool, anyways, so I mean I guess I wouldn't be that worried about it," said Malmors.
But, the CDC says some bacteria can survive for a while in chlorinated pools. The staff has been adding a chlorine treatment to the pool to disinfect the water since Saturday. The treatment needs 24 hours to work and the ducks kept coming back.
Wednesday night, lane markers and floaters were kept in the pool to try and scare the birds away. It seemed to have worked because the pool reopened just after 10 a.m. Thursday.
City officials ask that you do not feed the ducks in the area. Food attracts them and encourages them to return.