Computer-aided learning (CAL) is used increasingly to teach anatomy in post-secondary programs. Studies show that augmentation of traditional cadaver dissection and model examination by CAL can be associated with positive student learning outcomes. In order to reduce costs associated with the purchase of skeletons and models and to encourage study outside of the laboratory period, interactive web-based CAL modules were developed for a comparative vertebrate anatomy course using skulls on hand, an open source image editor, and a simple text editor. Each module featured images of an animal skull in four orientations and allowed the user to identify individual bones and bony landmarks with a mouse. Study modules and practice quizzes were made available to students through the institution's learning management system for 24-hour access. (Contains 2 figures.)