Snowy egrets (Egretta thula) are small herons found throughout the Americas, from the Great Lakes to Argentina. The first problem is to distinguish them from the very similar Great and Cattle egrets. Seen as photos they look almost identical, but Snowy egrets have black bills and legs with yellow feet whilst Cattle egrets have yellow bills and grey legs. It's also a question of habitat as Cattle egrets follow cattle in pasture, snapping up disturbed invertebrates, whilst Snowys feed by water. Great egrets also feed in water, but they are quite a lot bigger, up to a metre in height as well as having yellow bills.