Penguins which had to be given anti-depressants after a break-in left them stressed have made a full recovery.
A trespasser broke into their enclosure at Scarborough's Sea Life Centre one year ago and chased the birds.
Staff at the centre said the birds had been left "frightened" and needed medication, reports the BBC.
The birds have now recovered and two couples have even produced eggs which are due to hatch later this year, curators said.
Lyndsey Crawford, displays curator, said: "Penguins only lay eggs when they feel happy enough to do so.
"This is a really good sign particularly as this is the first time for each couple."
Penguins are particularly vulnerable to any change of routine which was why the incident last year had proved so upsetting for them, she explained.
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