Visitors have been flocking to an area of Staffordshire to see a daily display by tens of thousands of starlings.
Starling numbers have halved in the last 25 years
Every morning and evening the birds, known collectively as a mumuration, have been impressing crowds above an industrial estate in the Stone area.
Some experts said they believed the birds could be "catching up" with each other when they gather in the skies.
They are a mix of British and European birds and it is thought many will leave for Russia in the next few weeks.
Starling numbers have halved in the last 25 years and they are now red-listed as an endangered species.
Visitor John Shaw said their numbers have grown.
He told BBC News: "They arrive about this time (1700 GMT) every night.
"Their numbers have increased. We had about 60,000. It's now about 100,000 and we think they will be here for a few more weeks before they disappear."