Tusk weight in Ugandan elephants

effect.

closely. He suspects that the trend started long before 1925 and has continued after 1958. He has reason to think that the same cause, operating in the past, underlies the tusklessness of many local populations of Asian elephants. We seem to have here a prima facie case of rapid evolution taking place before our very eyes, one that would repay further research.

Let me turn, now, to another case, one in which there is some intriguing recent research: a study of lizards on Adriatic islands.

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