What Is This ‘Bird Theory’ Trend Going Viral on TikTok?

The "Bird Theory" Trend on TikTok

A popular trend is testing relationships on TikTok, with thousands of users participating in the "Bird Theory" challenge.

The trend involves telling a partner that a bird was seen and recording their reaction, but it has nothing to do with birds.

The "Bird Theory" videos are actually about testing a relationship using a scientific method known as the "Bid Test" to gauge a partner's engagement.

The viral TikTok trend is all about testing your relationship.

Author's summary: TikTok's "Bird Theory" trend tests relationships.

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Mental Floss Mental Floss — 2025-10-29