When penguins fluff their tiny feathers, they release bubbles that reduce the density of the water surrounding them, allowing them to travel quickly underwater


When penguins fluff their tiny feathers, they release bubbles that reduce the density of the water surrounding them, allowing them to travel quickly underwater


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5 Comments

  1. The bubble release reduces the friction between the penguin and the water it swims in. Shark skin comes to mind, since it serves a similar role of reducing the drag it experiences however not with air bubbles.

    [http://www.nydailynews.com/news/world/mystery-penguin-fast-swimming-discovered-article-1.1188268](http://www.nydailynews.com/news/world/mystery-penguin-fast-swimming-discovered-article-1.1188268)

    r/http://www.icr.org/article/scientists-discover-secret-fast-swimming/

    A paper talking about drag reduction (link to bubble drag reduction): [https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5624150/#sec3title](https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5624150/#sec3title)

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