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 your partner you saw a bird and recording their reaction.

The purpose of this trend is not about birds, but rather a relationship test using the "Bid Test" method to gauge your partner's engagement.

The "Bird Theory" videos have nothing to do with bird videos or aren't even about birds at all.

Couples are using this trend to test their relationships, with the "Bid Test" serving as a scientific method to evaluate their partner's response.

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

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Mental Floss Mental Floss — 2025-10-29