Weedy seadragons are one of only two species of seadragons, the second is known as the leafy seadragon (Phycodurus eques) due to the greater number of leaf-like appendages along its body (2). Seadragons resemble the seahorses to which they are related, having a bony-plated body and elongated snout; their tails are not prehensile however (3). Adult weedy seadragons are a reddish colour, with yellow and purple markings; they have small leaf-like appendages that provide camouflage and a number of short spines for protection (4). Males have narrower bodies and are darker than females (4). Seadragons have a long dorsal fin along the back and small pectoral fins on either side of the neck, which provide balance (3).