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This is Scientific Americans' 60-second Science. I'm Jason Goldman.

Cabo Polonio is a small seaside village on Uruguay's Atlantic coast. The permanent year-round

population is just 95 people living in around 50 homes. Another 350 homes are used between December and February by tourists hoping to see pinnipeds,

fur seals and sea lions that haul out on the town's rocky cape. In January alone, more than 30,000 tourists visit. What are the

impacts of so many tourists on these marine mammals? Between 1996 and 2014, European and South American

biologists monitored both the animals and the people to find out. Over that time span, the Pinniped's

tolerance for human disturbance declined. When annoyed, they moved further away from the tourist

viewing area, or even dive back in the water to swim away. Those responses are contrary to the

common assumption that wildlife becomes habituated to human

activities. The study is in the journal Applied Animal Behavior Science. The researchers think

that a fence, initially constructed in the late 1990s, is to blame. It was built with good

intentions to keep people a safe distance from the colony,

but the fence isn't long enough to keep people away from the most critical part of the habitat.

It might even funnel people towards that area as they try to find viewing spots closer than the

fence would allow. Or it could be that the fence actually does its job

keeping people away, but as a result, they are just far enough away that the animals never

really get used to them. The truth is that pinnipeds seem to be doing well in Uruguay. While the

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