Clay: The Origin of Species

Claymation illustrating the possible ways different species could have originated. Cool jazzy soundtrack. Evolution. Charles Darwin. Biological change through time. Animals. Adaptation. Discusses the nature of species and the essential role that reproductive isolating mechanisms have in their origin. Pictures the existence in nature of a number of reproductive isolating barriers (ecological, seasonal, sexual, hybrid invariability, hybrid sterility). Indicates that any particular barrier has a multiple number of reproductive barriers. Stresses the lack of correlation between morphology and reproductive isolation. Lecture given by G.L. Stebbins. Genetics. Natural Selection.