The term 'Heron Cousin' refers to four different species of birds that are related to herons. These species include the STORK, EGRET, Stilt, and IBIS. The STORK is a large bird with long legs and a long neck, while the EGRET is a white bird with a long neck and long legs. The Stilt is a long-legged wading bird with a long neck and a long bill, and the IBIS is a long-legged wading bird with a curved bill. All four species are related to herons and share similar characteristics.