Grab students' attention with a parasitic bird that lays eggs in other birds nests, and then those bird's babies grow to dominate the attention of the host mother bird, eventually shoving the host's babies out of the nest. This example illustrates a symbiotic relationship that students are intrigued by but probably haven't heard of.
Your purchase includes a mark a recapture lab, student lab handout, 27 color slide PowerPoint presentation, and student note handout. The lab instructions are in the PowerPoint as well as recommended video links. Content is designed for one ninety minute class period or two forty minute class periods.
I always use an example of kids being in parasitic relationships, with friends always mooching pizza or paper and pencil in class, and drive home the idea that students always should give back so that they aren't considered a parasite by their friends.
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