Tiny crystals give a plain fish twinkling, colorful dots under light
Puzzling fish twinkles from wide-banded hardyhead silversides might lead to ultra-tiny sensors
![scores of small silver fish swimming](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2021/04/040621_sm_flashyfish_feat.jpg?fit=1030%2C580&ssl=1)
You don't see it from a distance, but the white backs of hardyhead silverside fish (seen here swimming in the Red Sea) can twinkle with tiny flashing blue and yellow dots.
Georgette Douwma/Science Source