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 about birds, but rather about testing relationships using a method known as the "Bid Test" 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.

Couples are using this trend to assess their partner's interest and attention in their daily life.

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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