Thousands of years ago, humans domesticated every possible large wild mammal species fulfilling all those criteria and worth domesticating, with the result that there have been no valuable additions of domestic animals in recent times, despite the efforts of modern science.

Summary

This quote highlights the idea that throughout history, humans have already domesticated all the large wild mammal species that were deemed suitable for domestication. As a result, there have been no noteworthy additions of domestic animals in recent times. Despite the advancements in modern science, which could potentially aid in domestication efforts, there have been no significant discoveries of new species that align with the criteria and benefits of domestication. Thus, this quote suggests that the pool of selectable domestic animals has remained stagnant for thousands of years.

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