Glucose screening and tolerance tests during pregnancy. A glucose screening test is a routine test during pregnancy that checks a pregnant womanâs blood glucose (sugar) level. A glucose tolerance test is done if a glucose screening test result is higher than normal. It is used to diagnose gestational diabetes. Gestational diabetes is high blood sugar (diabetes) that starts or is found during pregnancy.
The Arctic tern is known to make the longest annual migration in the animal kingdom. During its breeding season, it is found far to the north where summer days are long, and it winters far south in the southern hemisphere, where the days are longest during November to February.he Arctic tern is notorious for its long-distance migration between the breeding grounds and the winter quarters in the Southern Ocean. This knowledge has been obtained by ringing and observations of movements at-sea.
This map shows the migration route taken to and from New Zealand by eastern bar-tailed godwits. They leave from Alaska in the northern autumn, and until recently it was assumed they followed a coastal route southwards that would allow them to feed and rest along the way. But there is now conclusive evidence that most take the direct route south across the central Pacific to New Zealand. Unlike seabirds, they cannot rest on water or feed at sea, so this 11,000-kilometre journey is the longest non-stop flight undertaken by any bird. The return to Alaska is taken in stages so they arrive in good condition to breed in May.