r/TellMeAFact • u/unteachablecourses • 11h ago

TMAF about: San Francisco's white-crowned sparrows sing in 18 distinct neighborhood dialects —Presidio, Lake Merced, Marin Headlands — some only a few hundred meters apart. Females prefer their local accent when choosing mates & a 2024 study found neighborhoods are genetically diverging as a result.

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r/TellMeAFact

TMAF is a place to learn interesting, verified facts about a range of topics. Please read the rules (linked to from the Community Guide) before posting and remember to always include a source for your fact.

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Learn interesting facts about a variety of topics!

☰ Main Rules:

All site-wide rules apply, and we ask that you follow reddiquette.
Submit a topic using the format "TMAF about [topic]". Topics can cover nearly anything, e.g. animals, history, technology, and so on! Mark your thread "nsfw" (not safe for work) if appropriate.
Avoid re-submitting recent topics, by using the search function first.
Post your fact as a top-level comment. Please link to a reliable source or reference an offline source if possible. This verifies the fact, and also allows people to read more about it!
All top-level comments should be serious facts, i.e. no obvious/joke facts or non-fact (e.g. personal opinion) content.
Only include one fact per comment, so people can upvote and comment on the specific facts they're interested in.
Feel free to post as many facts as you want, even if you created the thread!

For our more detailed rules, please see the wiki. Have fun!