Oops! This wasn’t supposed to happen: this Black-headed Gull was observed in Denmark last week wearing two metal rings (both from Finland):
It’s not uncommon for gulls to wear multiple rings, but no more than one metal ring should ever be fitted.
It’s hard to imagine how this could have happened and I’m sure that there’s a story behind it.
The ringer must have been distracted, but even so, it’s not a pretty mistake to make.