From England to South Africa is a journey of 6,000 miles. And the birds not only return from Africa to England next spring,but often they come back to nest in the very same house where they nested the year before.

• 从英国到南非有6，000英里的距离，这些鸟不仅在第二年春天从非洲返回英国，而且它们经常返回前一年它们筑的巢窝里。