About r/biology
In its own words:
A place to discuss all things biology! We welcome people and content from all related fields.
Community guide
r/biology (#159, about 5.5 million) is for biology science discussion—A place to discuss all things biology! We welcome people and content from all related fields.. Collected rules (11): No ID requests; No Trolling; No Spamming; No Hate Speech or Bigotry; No Personal Attacks; Quality control; No medical questions; No conspiracy theories; Do not submit posts about religion; No surveys.
Fit
Biology topics under the sub’s science/civility rules. Sample ~15.6 ppd.
Versus science and psychology
r/science is broader STEM; psychology is that discipline. biology is organism/life-science scoped—homework dumps often belong in homework-specific rooms if rules here ban them.
Practical pointers
Follow collected rules on sourcing, homework, and medical advice if present; live page wins on edge cases.
SubMouse Editorial
The community was created on Mar 25, 2008, which makes it 18 years old. Since Oct 26, 2026, it has gained 440 subscribers (+0.01%). It sits just behind r/hiphopheads (#158) and ahead of r/boardgames (#160) in our ranking.
What sets r/biology apart
r/biology is far more text-driven than most big subreddits: 76% of its recent posts are text posts, against a median of 34% across the Top 100.
Subscriber growth
Between Sep 19, 2026 and Nov 2, 2026, r/biology climbed from 5,475,355 to 5,478,447 subscribers (+3.1K, +0.06%). That is about 70 new members per day. The chart uses our weekly snapshots (9 so far), so it gets longer every week.
What r/biology talks about
Across 90 recent posts (Oct 29–Nov 5), the words that come up most are “explain”, “help”, “possible”, “biological” and “footage”. Other frequent themes are life, watching, study, cells, actually and brain. Recurring phrases include “earth begin” and “health informatics”. By format, 76% are text posts, 12% are videos and 12% are links.
Popular post flairs: See Note (24), :snoo: question (23), :academic: academic (14), :snoo: video (10), :snoo: discussion (9), Careers (4).
Activity and best time to post
r/biology gets about 16 new posts a day. The public archive holds 194,876 posts and 1,562,675 comments in total, about 8.0 comments per post. Last week the busiest day was Tuesday (17 posts) and the quietest was Friday (8). Posting peaks around 21:00 UTC and is lowest around 02:00 UTC.
Rules of r/biology
The moderators of r/biology list 11 rules. In short:
- No ID requests
- No Trolling
- No Spamming
- No Hate Speech or Bigotry
- No Personal Attacks
- Quality control
- No medical questions
- No conspiracy theories
- Do not submit posts about religion
- No surveys
How to join
Open reddit.com/r/biology and press “Join”. Read the community rules in the sidebar before you post: every subreddit is run by its own volunteer moderators.
Frequently asked questions
How many members does r/biology have?
r/biology has 5,478,447 subscribers (Nov 2, 2026), which makes it the #159 safe-for-work subreddit in the SubMouse ranking. It added 3,092 members between Sep 19, 2026 and Nov 2, 2026.
How old is r/biology?
r/biology was created on Mar 25, 2008, so it has been around for 18 years. The oldest post in the public archive is from Mar 26, 2008.
How active is r/biology?
Moderately: r/biology gets about 16 new posts a day (average of the last four weeks). Over its lifetime the archive counts 194,876 posts and 1,562,675 comments. In a sample of 90 recent posts we counted 79 different authors.
When is r/biology most active?
Based on post counts from Oct 29, 2026 to Nov 4, 2026, the busiest day was Tuesday and the quietest Friday, and most posts arrive around 21:00 UTC, with the fewest around 02:00 UTC. More posts also means more competition, so a quieter hour can help a post get noticed.
What is r/biology about?
The community describes itself as: “A place to discuss all things biology! We welcome people and content from all related fields.” Recent post titles often mention explain, help, possible, biological and footage. Most posts are text posts (76%).
Is r/biology safe for work?
Yes. Reddit does not mark r/biology as an 18+ (NSFW) community. SubMouse lists safe-for-work subreddits only.
How do I post on r/biology?
Join the community on Reddit first, then use “Create post”. r/biology accepts both text and link posts, with images and videos enabled. It has 11 posted rules, starting with: “No ID requests”; “No Trolling”; “No Spamming”. Moderators remove posts that break the rules, so read them in the sidebar before posting.
Which communities are like r/biology?
Communities with similar topics include r/science (34.6M), r/Futurology (21.7M), r/Filmmakers (3.1M), r/cscareerquestions (2.4M) and r/Guitar (3.5M).
Stats from public data (data updated Nov 2, 2026; activity, rules and archive totals via the Arctic Shift archive, Nov 6, 2026). Point and comment counts are archive snapshots and can be lower than on Reddit today. SubMouse is an independent directory and is not affiliated with Reddit or the moderators of r/biology.