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This is Scientific Americans' 60 Second Science.

I'm Jason Goldman.

In North America, many 60 Second Science. I'm Jason Goldman.

In North America, many critters commonly encountered today,

like wild turkeys or white-tailed deer,

were brought back from near oblivion through conservation efforts led by hunters.

Meanwhile in Africa some of the most charismatic species are now being hunted into extinction.

But hunting can also have impacts that are far more subtle.

Take the brown bear known here in the US as the grizzly. When large mammals like grizzlies

are hunted, evolution might select for speedier life cycles.

That is, in order to successfully reproduce before they risk getting shot,

bears might begin having cubs at a younger age.

...