The ospreys have nested at the site since 2004
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The only known pair of nesting ospreys in Wales has successfully hatched two chicks.
The birds of prey have returned from Africa to the nesting site at Glaslyn, near Porthmadog, Gwynedd, to raise chicks each year since 2004.
The first egg of three laid in April by the female osprey hatched late on Wednesday and the second on Friday.
A 24-hour RSPB protection team watched the hatching via a "nestcam" placed at the site.
Last year, an osprey pair hatched two chicks from three eggs.
The viewing site is manned by RSPB staff and volunteers and is visited by thousands of people hoping to catch a glimpse of the ospreys.
Following the hatching of the first osprey chick at the site, Emyr Evans, RSPB Cymru osprey officer, said: "Both adult birds had been very agitated during Wednesday, so we knew that hatching must be imminent.
"Neither of them wanted to be away from the action, so they were even eating on the nest - which is most unusual.
Mr Evans said the first chick was feeding on small morsels of fish brought back to the nest by the adult male.
The remaining egg is expected to hatch soon.