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.
1 Wings: Wings are one of the most defining characteristics of birds, and even flightless birds have vestigial or adapted wings they may use for swimming, threat displays or courtship dances. The size and shape of wings varies between species based on how the bird flies, and wing markings are useful to identify bird species. 2  Bill: All birds have a bony, keratin-covered projection forming their mouth.