Birdwatchers have been treated to sightings of one of Britain's most elusive birds at a popular North East nature reserve.
A bittern has been spotted at RSPB Saltholme, near Stockton, with Northern Echo Camera Club photographer Gareth Bowes capturing the secretive bird on camera.
Gareth has photographed the bird during visits to the nature reserve over recent months, providing striking views of a species which can be notoriously difficult to see.
Bitterns are members of the heron family and are famed for their remarkable camouflage, with their streaky brown plumage allowing them to almost disappear among reeds.
A Bittern at RSPB Saltholme (Image: Gareth Bowes/CAMERA CLUB)
They spend much of their time concealed within dense reedbeds, meaning even experienced birdwatchers can struggle to catch a glimpse.
However, RSPB Saltholme's extensive wetland habitats provide an ideal environment for a huge variety of birdlife, and have previously attracted bitterns.
The birds are perhaps best known not for their appearance but for the extraordinary "booming" call made by males during the breeding season.
The deep, foghorn-like sound can travel considerable distances across wetlands and is often the first indication that a bittern is present.
When they do emerge from the reeds, however, they make an impressive sight.
Bitterns are large birds, measuring around 70 to 80cm in length and possessing broad, rounded wings which become particularly noticeable in flight.
Their diet consists largely of fish, amphibians and other small wetland animals, which they hunt among reedbeds and shallow water.
The species also has a remarkable conservation story in Britain.
A Bittern at RSPB Saltholme (Image: Gareth Bowes)
Bitterns disappeared as a breeding species in the UK during the 19th century following extensive loss of their wetland habitats and persecution.
Although they later returned, their numbers fell perilously low again during the 20th century.
Conservation work to protect and restore reedbeds has since helped the species recover, although the bird remains one of the more difficult wetland species to encounter.
The Tees Valley has played its own part in the bittern's recent history in the North East.
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In 2012, a male bittern was heard booming at RSPB Saltholme, believed at the time to be the first recorded booming male at the reserve, although it failed to attract a mate.
Another male was heard booming at Saltholme a decade later in 2022, accompanied by sightings of the famously well-camouflaged bird.
Elsewhere in the region, bitterns have occasionally appeared at wetland reserves including Rainton Meadows in County Durham, where sightings have previously generated excitement among birdwatchers.