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Dwindling natural habitats are causing a significant decline in certain seahorse species. To bolster populations, researchers in Australia are building seahorse hotels and leaving the lights on.

Editor’s note: A version of this story appeared in CNN’s Wonder Theory science newsletter. To get it in your inbox, sign up for free here. Landing on the moon is one of the most challenging ...

Fingernail-size pygmy seahorses are some of the smallest vertebrates on the planet, but British marine biologist Richard Smith makes their colorful world seem larger than life. Smith began studying ...

Marine life sightings often include pygmy seahorses, hairy squat lobsters, cuttlefish and octopuses. For cave diving enthusiasts, the Leru Cut on the Russell Islands is another incredible underwater ...

Coral reefs conceal countless sea creatures that go to great lengths to avoid detection. Pygmy seahorses perfectly camouflaged among a forest of coral. Stonefish indistinguishable from their rocky ...