JOHNSTON, Iowa [WOI-TV] — Since January, Iowa Bird Rehabilitation (IBR) says dozens of trumpeter swans have died from lead poisoning. IBR, a nonprofit organization that steps in to rescue, rehabilitate and release wild birds back into the wild, takes in around 2,000 birds yearly. On average, only one or two are trumpeter swans. But over the past few months, the nonprofit has admitted 11 swans into their care. Iowans send tips to IBR of birds they notice may be ill or injured, so the nonprofit can monitor, rescue and bring the birds into their care.

There’s not a clear answer where the lead poisoning these trumpeter swans — and other bird species — has come from, but IBR said some causes could be fishing tackle or leftover fragments of lead shot from waterfowl hunting (before using lead was banned in the late ’80s).

And with the drought that a majority of the state of Iowa is facing right now, receding water levels mean trumpeter swans, with those long necks of theirs, can accidentally consume lead fragments at the bottom of lakes and rivers more easily.

To help omit lead introduction to bodies of water, IBR suggests using lead-free tackle when fishing and lead-free ammunition while hunting. The nonprofit also recommends anyone who sees a bird needing help or exhibiting abnormal behavior to contact them.