BirdFont isn[SQ]t a widely known or established font family or software. There[SQ]s no readily available information about a font with that name through standard font repositories or online searches. It[SQ]s possible :

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It[SQ]s a very niche or newly created font:

Many fonts are created for specific projects or individuals and aren[SQ]t publicly released.
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The name is slightly different:

There might be a typo in the name, or a similar-sounding font exists.
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It[SQ]s a private or internal font:

Some companies or organizations use custom fonts internally that aren[SQ]t available to the public.

If you encountered this name in a specific context (a document, website, software), providing more information about that context might help identify what it refers to.