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

The "Bird Theory" Trend on TikTok

A new trend is taking over TikTok, where users tell their partners they saw a bird and record their reaction.

Thousands of users are participating in the "Bird Theory" trend, but it has nothing to do with birds.

The trend is actually a relationship test, using a method known as the "Bid Test" to gauge a partner's engagement.

The "Bird Theory" videos are about testing your relationship, not about birds at all.

Couples are using this trend to see how their partner reacts to a seemingly insignificant statement.

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

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Mental Floss Mental Floss — 2025-10-29

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