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![A photo of Oceana's ice class research vessel, the Hanse Explorer, on the Baltic Sea.](/sites/default/files/styles/3_2_small/public/2023-11/1_HanseExplorer.jpg.webp?itok=Iuejc28h)
slideshow
Biodiversity in the Baltic Sea
In the spring of 2011, a research crew from Oceana spent two months in the......![A reddish-orange nudibranch. A reddish-orange nudibranch.](/sites/default/files/styles/3_2_small/public/2023-11/5887255127_bf3e8b4f18_b.jpg.webp?itok=JQKxm79r)
slideshow
A Collage of Nudibranch Colors
Nudibranchs are a kind of sea slug, and their 3000 species are found from the...![Stunning Sea Slug Sea Slug](/sites/default/files/styles/3_2_small/public/2023-11/7613855538_8790f417af_o.jpg.webp?itok=t6J-hPA5)
Photo
Stunning Sea Slug
Not all slugs (snails without shells) are slimy brown pests found in your backyard......![Relatively slow moving, juvenile plane-head filefish Monacanthus hispidus (Monacanthidae) travel along with the algae. They pick off and eat small animals as they move around in the rotating sargassum ball. Adult filefish only grow to be about 11](/sites/default/files/styles/3_2_large/public/2023-11/filefish_small.jpg.webp?itok=8mBPVyld)
Personal Perspectives
A World Adrift: Life in the Sargassum
The open ocean is surprisingly barren to the naked eye. Every now and again you......
May 2012
![This shrimp is colored to fit in - probably why they are common members of the seaweed community.](/sites/default/files/styles/3_2_small/public/2023-11/Latreutes.jpg.webp?itok=nH3nz7aF)
slideshow
A World Adrift: Life in the Sargassum Slideshow
Smithsonian Marine Science Network Postdoctoral Fellow, Seabird McKeon, returns......![Aeolid Nudibranch Defense A nudibranch showing a closeup of their fleshy, tentacle-like growths, called cerata.](/sites/default/files/styles/3_2_large/public/2023-11/aeolid_nudibranch.png.webp?itok=hNwXOH9Y)
Article
How Sea Slugs Steal the Defenses of Their Prey
Not all slugs (snails without shells) are slimy brown pests found in your backyard......
January 2014
![Nine small invertebrates held on two fingers.](/sites/default/files/styles/3_2_large/public/2023-11/Best_I_think_P6282780_fixed.jpg.webp?itok=2LYWdiBT)
Personal Perspectives
On Biodiversity: Understanding its Meaning and Importance
The ocean is home to a phenomenal diversity of marine organisms. They have evolved......
August 2011
![A bright-green sea slug with a black background.](/sites/default/files/styles/search_result/public/Elysia_chlorotica.jpeg.webp?itok=9PWXHz5H)
audio