Crested oropendola and their “blue nests” made of plastic waste at the mouth of the Amazon River

It was also a TIL for me, as I wasn't aware of this phenomena

Picture taken from:

Tapirs, bats and nests: How plastic infiltrates Amazonian wildlife

Paywalled link to the study for those interested (if anyone has an free version, feel free to share it):

Blue nests: The use of plastics in the nests of the crested oropendola (Psarocolius decumanus) on the Brazilian Amazon coast