More than 70 birds have died at a nature reserve near Ripon after an outbreak of bird flu.
The outbreak has affected a colony of breeding black-headed gulls at Nosterfield Nature Reserve.
Staff and volunteers have been forced to wear specially designed PPE suits, hats and gloves to collect the corpses from the 60-hectare site.
Visitors have been warned that they could see distressing scenes with more birds likely to die from the disease in the coming weeks.
Simon Warwick, director of the Lower Ure Conservation Trust which runs Nosterfield, said:
“The gullery is in front of the main hide at Nosterfield and is usually a hive of activity in spring, with noisy adults feeding lots of hungry young.
“The disease is affecting many adult birds so you can imagine that what is happening at the moment is traumatic to say the least.
“But we are powerless to stop the spread of bird flu. Our biggest fear is the virus spreading to breeding lapwing and curlew, two species for which Nosterfield is famous.”
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The disease has killed black-headed gulls at several wetland sites across Yorkshire.
More than 1,000 gulls have died across the county so far, with the number expected to rise.
Visitors have been told under no circumstances to go near a dead or dying bird at the reserve. Dogs should also be kept on short leads during visits.
Mr Warwick added:
“Away from the main hide there is so much to see at Nosterfield at the moment, so our advice certainly to people with young children is come along but stay away from the main hide.”