We came across this amazing video of a Sea Angel by the Aquatilis Expedition. Those beautiful colors are actually their internal organs! Its heart is red, gonads red-orange, and other internal structures are yellow. The ocean is truly magnificent. 📷: @aquatilis_expedition (IG) #blueoceans | SSI

The blue angel sea slug is a tiny terror with a brutal survival strategy #history #facts #survival #nature | Beyond Belief

One sea angel (aka sea slug, if you're impolite) is stunning; two—engaged in a 4-hour mating dance that still allows them to hunt—is a rare and ridiculously beautiful sight. Filmed by marine biologist Alexander Semenov deep in the Arctic Ocean, via National Geographic: bit.ly/2gPUMsE. | California Academy of Sciences