Strangely adorable video of sea slugs eating a blue button jelly alive

Yesterday, I posted a photo of Glaucus atlanticus — a strange little creature, related to mollusks, which floats through the ocean and eats (among other things) the jellyfish-like Portuguese Man-Of-War.

In response, marine biologist Christopher Mah sent over this video, in which two specimens of Glaucilla marginata — a smaller relative of Glaucus atlanticus — nibble on the still-living flesh of a colonial organism called a blue button. This proves to be cuter than it sounds.

Part of what makes the video so mesmerizing is watching the Glaucilla marginata move around. These creatures travel in a very laid-back way. Inflating a gas bubble in their stomachs, they float around on their backs, wherever the waves will take them. That bubble seems to lead to some endearing, baby-sloth-like flips and turns as they try to position themselves to take bites out of the blue button. OM NOM NOM.



  1. That was pleasantly disturbing. Thanks! Nudibranchs make me wish I were a marine biologist and a hot glass sculptor.

    Yesterday, I was wondering how the little nudibranchs get the toxin to where they can put it to good use. Are they using the original nematocysts from their food source somehow as a delivery system or do they have some kind of things of their own?

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