Youtube decided to recommend me this, and this courting behavior among Fiddler crabs (潮招き or しおまねき) is pretty cool! 
Bonus news story! XD 
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Interesting documentary about cold-water reefs! ^>^
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Optimistic and inspiring vid about returning a part of the Portuguese landscape back to the wild. ^>^ Tagging @pepperdfa because 
friends! 
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don’t they not have bones?
Just watch the vid and all shall be explained! 
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Here are some tiny fish with big personalities: blennies!
Stiped poisonfang blenny
Australian blenny/Tiger coral blenny
Bicolor blenny
Blue striped blenny
Tailspot blenny
Midas blenny
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Cool video that has a bit of a long intro. After 3:30 the real underwater footage starts. ^>^
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Inspiring stuff. Also, just relaxing to watch. 
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Another deep sea documentary, this one about the Oarfish.
I love how the Japanese name is a hint to its imagined role in legend: 竜宮の使い or リュウグウノツカイ**, the Messenger of the Dragon Palace.
The Dragon Palace is according to legend at the bottom of the ocean and where queen Orihime lives. (see the legend of Urashima for details: Urashima Tarō - Wikipedia )
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This is a cool vid about some Australian fishies on North Stradbroke Island! ^>^
Fish in this video:
Pacific blue-eye
Mangrove red snapper/ Mangrove Jack (young) 胡麻笛鯛 or ごまふえだい
Terapon jarbua/Crescent Grunter コトヒキ
Ornate rainbowfish “Ornate wrad”
Broad-shelled snake-necked turtle (what he calls “expansive turtle”, from Chelodina* (Chelydera) expansa with the distinctive long neck) In Japanese, this one is called コウヒロナガクビガメ broad-shell, long neck turtle! XD
Gambusia/Mosquito fish 蚊絶やし or かだやし
Out of the water:
カンガルー
コアラ
A species of monitor? 大蜥蜴 or おおとかげ
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While this thread is more about wild animals, this is a really cool video about the aquarium hobby and this insane guy’s fish room and ongoing projects to breed multiple species of fish. It’s just a relaxing watch, with lots of beautiful tanks and fishies.
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