Started in 1901 by Prince Albert I. Unfortunately, I don’t know the names of all the species below (please let me know if you do). Regardless, they’re amazing to look at.
My new favorite species which I believe to be a Porcupine Puffer.
Leaf scorpionfish.
Pinecone fish.
Nemo in his anemone. 
Camouflage.
It uses its front hand-like fins to guide itself forward and to the sides. 
Wide eyed flounder.
Gangster crab.
Cuttlefish – one of the most intelligent invertebrates.
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LOL…loved the gangster crab.