Evolutionary selection pressures do work to diminish animal species occasionally. There's a well known phenomenon called "island dwarfism:" Small animals tend to increase in size (compared to their mainland brethren) while large animals tend to shrink. Has something to do with the lack of predators plus the relative scarcity of food.
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Evolutionary selection pressures do work to diminish animal species occasionally. There's a well known phenomenon called "island dwarfism:" Small animals tend to increase in size (compared to their mainland brethren) while large animals tend to shrink. Has something to do with the lack of predators plus the relative scarcity of food.