This is a unit build around the documentary film Blackfish (available on Netflix). It includes two study guides for the film, printer-friendly versions of articles related to the topic (both for and against Sea World), handouts on annotating text and writing an argument essay, a jigsaw activity with rubric, a performance task written in SBAC style (argument essay), an extra credit assignment, an exemplar argument essay, and a worksheet on writing persuasive statements. This is EVERYTHING you would need to teach this unit.
I used this in a 7th grade English class, however, it could also be used in high school English or science classes.
You might also like my Super Size Me Argument Unit.