An Insectivorous Gray Lizard Was Once Very Abundant in Disturbed

Essay

An insectivorous gray lizard was once very abundant in disturbed habitats of a small island off the coast of the eastern United States. When the black lizard, a close relative, was introduced from South America, the range of the gray lizard was reduced in size, and over the course of a few decades, the average jaw size of the gray lizard increased. Explain these phenomena, giving the names for the phenomena.