Usually, watchful waiting is an outpatient process and may have a duration of months or years. In contrast, medical observation is usually an inpatient process, often involving frequent or even continuous monitoring and may have a duration of hours or days. 1 Medical uses.
Shearwaters earned their name by their ability to cut - or shear - the water with their wings, although until recently they were known as 'muttonbirds'. This name was given to them by early European settlers, who killed the birds for food and found that their flesh tasted like mutton.
Wind moving toward a bird with spread wings can hold the bird up, thanks to the airfoil shape of the wings (see airfoil illustration above). Birds that fly on moving air currents often have long, narrow wings, such as gulls and albatrosses.