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 to test relationships using a method known as the "Bid Test", which gauges a partner's engagement.

The "Bird Theory" videos have nothing to do with birds, but rather serve as a way to assess the relationship.

Couples are flocking to TikTok to share their experiences with the "Bird Theory" trend, making it a viral sensation. Author's summary: TikTok's "Bird Theory" trend tests relationships.

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Mental Floss Mental Floss — 2025-10-29