We developed laboratory exercises using zebrafish ("Danio rerio") and nematodes ("Caenorhabditis elegans") for a sophomore-level Integrative Biology Laboratory course. Students examined live wildtype zebrafish at different stages of development and noted shifts occurring in response to "fgf8a" deficiency. Students were introduced to development in other fish species to demonstrate how variation in developmental systems affects phenotype. Finally, students cultured "glp-1(bn18ts) C. elegans" mutants under different conditions to illustrate how the environment and genetics act concurrently to modulate development. Undergraduate students responded positively to both the fish and "C. elegans" laboratory modules. These novel laboratory exercises are intended to promote an integrative view of biology and to help prepare undergraduate students for independent research with faculty. (Contains 1 table and 1 figure.)