An easy way to observe and study a large frog without dissection. The Pro-Sect system displays partially dissected, 4"-5" bullfrogs. The bullfrogs are displayed in a transparent, safe-to-handle, liquid-filled, plastic tray that is moldered and sealed. Some of the internal organs such as the liver, heart, and veins and arteries have been injected with colored latex to identify their circulatory function. A comprehensive study guide provides information to assist the teacher and students. Individual internal organs are identified on a transparent overlay for study or testing purposes.