Osprey eggs are incubated for about 37 days
Two ospreys who recently returned to their nest in Gwynedd have produced their first egg.
It is the fifth year running that the ospreys have flown in from Africa to raise chicks in the Glaslyn Valley near Porthmadog.
The female is expected to lay again on Thursday, with a possibility of a third egg appearing at the weekend.
The birds, the only known nesting pair in Wales, appear at almost the same time every year.
The egg was laid at 1716 BST on Tuesday, watched by RSPB Cymru staff and volunteers, plus a group of visitors at the viewing site near Porthmadog.
Emyr Evans, osprey project office for RSPB Cymru said: "This is the fifth season we have seen the pair produce eggs but it still gives me a fresh sense of excitement every time.
"Many visitors, as well as staff and volunteers here at the project have been thoroughly absorbed in the story of these birds since they first came to Wales, so to have the beginnings of another productive season underway is great news indeed."
The RSPB Cymru viewing centre is open to the public every day from 1000 to 1800 BST until the end of August.
The ospreys spend each winter in Africa and have successfully raised two chicks each year from their temporary Pont Croesor home between 2005 and 2007.