Black-throated blue warblers have been the focus of long-term studies since 1986 at the Hubbard Brook Experimental Forest in New Hampshire.
Their populations are cyclical, with many young produced in years where there is lots of food, primarily caterpillars, and few nest predators (squirrels and chipmunks).
A web-based teaching module has been developed based upon this research. Students can explore fundamental concepts in population ecology through extensive text, pictures, videos, and graphs.
This article summarizes the information in this scientific paper:
HR Sofaer, KM Langin, J Wilson, and TS Sillett. 2011. Demography of songbird populations in a rapidly changing world: the importance of long-term studies. American Biology Teacher 73(5): 285-287
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