Greater scaup they can fly at up to . Greater scaup are hunted from shorelines and in open water hunting blinds or layout boats, low-profile kayak-like boats that hunters lie inside. Hunters frequently use decoys to attract the birds, often arranged to simulate a raft of greater scaup and featuring an open area to attract the birds to land. In most countries where greater scaup are hunted, a duck stamp is required along with the normal hunting licences that are required to pursue other game. In America and Canada, waterfowl must be hunted with non-toxic shot. Greater scaup The greater scaup ("Aythya
Greater scaup 100% of female greater scaup, and 77% of female lesser scaup, had escalated levels of selenium in their bodies. Selenium is an occurring semimetallic trace element that occurs naturally in some soils and minute amounts are necessary for animal life. However excessive selenium can cause reproductive harm and is highly toxic. On their migration across the Great Lakes, greater scaups are at risk of ingesting selenium by eating the invasive zebra mussels, which can render a hen infertile. This sterilization of hens is causing the population to decrease. In a study of 107 scaup, they all had traces of iron,