2007 $1 Ocean Series-Bigbelly Seahorse Uncirculated Coloured Coin. The Bigbelly Seahorse are variegated shades of yellow, brown, orange, white, grey or mottled. Often colouration adapts to suit their marine surroundings. They live in shallow water sea grasses and sponge gardens in south eastern Australia and New Zealand. Seahorses have a prehensile tail which allows them to hold onto objects such as sea grasses and sponges. Please contact Adelaide Exchange Jewellers to find out more on this item.