You might have to look really hard at this video of the California Academy of Sciences' newest residents - the first ever born in an aquarium - to find the tiny fish. The adults are dwarfed by a pencil eraser; imagine how tiny the babies are!
Their camouflage is so perfect that they evaded scientists for years. In fact, they were first discovered by accident! A researcher was studying a sea fan sample in a laboratory when he found that it was hiding a tiny seahorse.