Pregnancy: Diagnostic Tests. The list of diagnostic tests mentioned in various sources as used in the diagnosis of Pregnancy includes: Urine human chorionic gonadotropin (HCG) tests - these are the basis of home pregnancy tests.
Eagles (and most large birds) fly by soaring; it's much more energy efficient than flapping their wings. We do use the technique for our own flights. The reason eagles and other soaring birds do this rather than flap is that they generally hunt from the air and so spend a lot of time waiting for prey. They don't need to go anywhere specific and don't need to move fast until they spot prey. Until then they want to use as little energy as possible.
The powerful eagle's survival is linked to its plumage, as its feathers function to insulate, protect, transport, and identify it. Feathers may become worn out, frayed, or weakened by a build up of oil and dirt. With a wingspan of up to 8 feet, plumage should be light for soaring, and strong and tight to insulate eagles from the cold and wet. The bald eagle has several layers of feathers, each serving a different function. Under the outer layer of feathers is an inner layer of downy ones. God's design of the feather's interlocking nature is amazing! Thus, often in their lifespan of thirty or so years, beginning about age four to five, they molt.