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As Ville Niemi comments above, the simplest way to make this not a coincidence is to have your protagonist do some work to find these people. In fact, I can't imagine how she could casually stumbl...
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#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/17781 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/17781 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
As Ville Niemi comments above, the simplest way to make this not a coincidence is to have your protagonist do some work to find these people. In fact, I can't imagine how she _could_ casually stumble over something called an Animal Suicide Club. It's the "Club" part which requires the work. Animal suicide researchers, yes, you'd probably find those without an enormous amount of Googling. But a club? People who make investigating animal suicides a _hobby_? You aren't going to see that posted on a flier at the local coffee shop. Other than at a veeeeeeery outré small liberal arts college, this is a group of people who will be weird even to the animal psychologists studying this behavior for a living. She's going to have to go looking for them — hear rumors, get slapped down by researchers who think the club is full of dangerous idiots and don't want her involved, warned off by ex-members, that sort of thing. Finding the club should be a significant obstacle in itself.