Twice the natural size, this replica of a sexually mature female bullfrog includes 10 organ systems. This model offers internal nares, vomerine teeth, Eustachian tube, and the nictitating membrane of the eye. There is a detachable heart, divided into anterior and posterior halves. Heart chambers and blood vessels throughout the body are color-coded to augment understanding of the circulation of the blood. More than 175 hand-numbered features are identified in the accompanying key, which also illustrates the male reproductive system.