This is a weedy seadragon, a rare type of seahorse, native to Australia, that resembles seaweed when floating. This explains the "weedy" in it's name, but it being a seadragon unfortunately doesn't mean it can breathe fire. These 2.5cm-long fish are harmless to humans and mainly feed on tiny shrimp. A couple at Birch Aquarium in San Diego, in the US state of California, recently gave birth to two bouncing, swimming weedy sea dragons.
Forgot the original discussion questions? Click here for a reminder!