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

The "Bird Theory" Trend on TikTok

A new trend is taking over TikTok, with thousands of users participating in the "Bird Theory" challenge. The trend involves telling a partner that they saw a bird and recording their reaction.

The "Bird Theory" videos have nothing to do with birds, but rather are a test of the relationship. The trend is based on the "Bid Test", a scientific method used to gauge a partner's engagement.

The viral TikTok trend is all about testing your relationship by using a scientific method known as the "Bid Test" to gauge your partner’s engagement.

The trend is a way for couples to test their relationship and see how their partner reacts to a seemingly insignificant statement. Author's summary: Trend tests relationships on TikTok.

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Mental Floss Mental Floss — 2025-10-29