Editing Polystyrene (section)

===Litter===
[[File:Physical weathering styrofoam cup Lake MIchigan.jpg|thumb|Discarded polystyrene cup on the shore of [[Lake Michigan]]]]
Animals do not recognize polystyrene foam as an artificial material and may even mistake it for food.<ref name="Hofer 2008 59">{{cite book|last=Hofer|first=Tobias N.|title=Marine pollution: new research|year=2008|publisher=Nova Science Publishers|location=New York|isbn=978-1-60456-242-2|page=59}}</ref>
Polystyrene foam blows in the wind and floats on water due to its low specific gravity.  It can have serious effects on the health of birds and marine animals that swallow significant quantities.<ref name="Hofer 2008 59"/> Juvenile rainbow trout exposed to polystyrene fragments show toxic effects in the form of substantial histomorphometrical changes.<ref>{{cite journal |last1=Karbalaei |first1=Samaneh |last2=Hanachi |first2=Parichehr |last3=Rafiee |first3=Gholamreza |last4=Seifori |first4=Parvaneh |last5=Walker |first5=Tony R. |title=Toxicity of polystyrene microplastics on juvenile Oncorhynchus mykiss (rainbow trout) after individual and combined exposure with chlorpyrifos |journal=Journal of Hazardous Materials |date=September 2020 |volume=403 |pages=123980 |doi=10.1016/j.jhazmat.2020.123980 |pmid=33265019 |s2cid=224995527 |url=https://zenodo.org/record/4588238 }}</ref>