Resumen:
Nowadays, plastic stands out as one of the most widespread pollutants in natural environments. While much research has concentrated on plastic pollution in marine ecosystems, it's essential to acknowledge that plastic also impacts terrestrial ecology. Birds, which construct nests using a variety of locally available materials, are not exempt from this
influence, as they sometimes incorporate plastics of human origin into their nesting materials. This study seeks to investigate whether the propensity to include such anthropogenic materials also extends to birds that construct nests within enclosed spaces, such as nest boxes. To accomplish this, we examined a total of 11 tree sparrow nests, categorizing the materials comprising these nests and placing a specific focus on the portion derived from human activities, notably plastics. Additionally, we explored whether there was
a preference among these birds for specific colours and types of anthropogenic materials when constructing their nests, which might be influenced by the availability of these
materials in the local area. Our findings revealed that vegetal materials constituted the primary component of the nests, followed by animal-derived mat...