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 you saw a bird and recording their reaction.

The purpose of this trend is not actually about birds, but rather about testing relationships using a method known as the "Bid Test" to gauge a 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 assess their relationship, making it a popular and viral sensation on the platform.

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

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Mental Floss Mental Floss — 2025-10-29