Check this out ... a woman is at some sort of animal park in France -- she has a mask around her neck but not covering her face -- and she approaches a swan.

All's well until the swan snaps at her face. Now get this ... the bird doesn't break the skin -- rather, it latches onto the mask, pulls it back and it snaps right onto her face. It became the perfect covering!!!

The woman falls backward ... probably at once feeling lucky she didn't get bit and super impressed by the bawdy bird.

The video has swept across France ... This clip is captioned, “You’ve been told: wear your mask!”