Reuters - As humans hunt, their prey gets smaller: study
A study of nearly 30 different species, including some plants, showed that human predatory tendencies has created pressures on them to become around 20% smaller and produce offspring 25% earlier (younger) than they have historically. Humans have preferred larger 'trophy' prey and this has created pressure to on animals to become smaller and mate earlier before reaching mature sizes (perhaps within a few decades). One major problem is that there are fewer offspring when an animal mates earlier in life.
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