The lesson contained in this article from the April 2016 issue of The American Biology Teacher is designed to engage students in three-dimensional learning as they participate in The Invasive Mosquito Project (USDA) -- a citizen science project. This project gives students the opportunity to study the population dynamics of two invasive, pathogen-transmitting mosquito species at different scales. In the lesson, students collect mosquito eggs in their local environment and rear a portion of them to adults. The students then determine the mosquito species and associated health risks in their community. Students and teachers may participate in a national mosquito-species-distribution study by submitting mosquito eggs and adults to the USDA. All data submitted will be available to all project participants, making each student and school part of a larger project. The lesson and all supplementary materials may be found at: http://www.citizenscience.us.