“The main toxic culprits are bird cages and toys made of consumable heavy metals, such as lead,” Dr Weller told The Daily Telegraph. “A lot of bird toys tend to have cheap metallic paint.

With denim, there is a less likely chance that a bird will pick and chew on them, but either way, any birds subject to these dangerous toys are ingesting microfibers that naturally shed from fabric.

The woman, who is based in Wales, disclosed her makeshift feeder that acts to benefits the birds. Many birders wanted to try it.