The pair remains in this position for 30 minutes and retreats.

In the mid-1970s only 200 pairs remained, but then the decline was stopped.

This process continued until only the last two pairs remain.

The pair remained together for two years before they split in September 2011.

There had been several such couples over the years, but only one pair now remained together.

The pair may remain in this position for an hour or more.

That seemed to make it official, even though 12 pairs remained.

The pair did not present under this name again but continued to link up together and remained in touch.

It is thought that only 1000 pairs remain in the wild.

The pair would remain behind bars for approximately 18 months.