With Kev away on holiday, birding along the west and east coasts of Scotland before heading into Yorkshire, I had to decide on my own plan for the regular Saturday outing. I asked my wife, Charlotte, if she’d like to join me, and she agreed, giving up her regular Pickleball session since she’d already played nearly every day during her club’s holiday week. I started looking for somewhere not too far away, with decent facilities and the potential for a year tick or two. In the end, I settled on a trip to Oldbury-on-Severn and the power station in search of black redstarts, followed by a visit to WWT Slimbridge to try for the Temminck’s stint.
There’s often a black redstart at the power station around this time of year, but reports over the past few days have mentioned anywhere from four to seven birds, so the odds of finding a male seemed promising. I’d only been to the site once before,back in March 2023, when I went to see an Alpine swift (report here).
The power station is located on the south bank of the River Severn, near the village of Oldbury-on-Severn in South Gloucestershire. The station comprised two nuclear reactors of the Magnox type, each originally producing about 217MW capacity. The first of the reactors started generating back in 1967 - a good year - and when it shutdown in 2012 was the oldest operating nuclear power station in the world. Over its lifetime the station generated circa 137.5 TWh of electricity - enough to power one million homes for 20 years. The reactor buildings were enclosed in prestressed concrete pressure vessels, the first in the UK to employ this method. The site used water from the River Severn via intake/outfall structures connected by underground culverts to the turbine hall's condensing units for cooling.
The last of the station's fuel was removed in early 2016 meaning about 99% of the site's radioactive hazard had been removed. Site decommissioning is still underway with current work focussing on waste retrieval, processing, storing and dispatch. The site is scheduled to enter the "Care and Maintenance" phase in 2027 with final site clearance and demolition planned for wel into the 2090s or 2100s.
With sunrise at 6:51 a.m., there was no need for an early start - I wanted enough light for photography - so we planned to arrive around 9.00am. Pulling into the car park, we spotted another birder setting up his gear, also heading out in search of the birds. He’d been before, though he admitted he still hadn’t managed a great photo. The sky was overcast, which meant good shots might be tricky, but hope springs eternal. He set off ahead of us, though we soon caught up and followed him to the spot where the best photos had reportedly been taken. Even before reaching it, I spotted a female perched on top of a white corrugated building.
The black redstart is a rare breeder in the UK and is more regularly encountered as a passage migrant and winter visitor from continental Europe - France, Belgium, and the Netherlands. Autumn passage typically spans from September to November, with a peak in October. Its preferred habitats include old buildings, industrial sites, quarries, churches and cathedrals, and cliff faces - basically places with bare or rocky ground.
The male is sooty-grey/dark overall, with a distinct bright orange.red tail, and often with a white-ish wing patch. Females and juveniles are a duller grey-brown overall but still with the orange-red tail - juvenile males often exhibiting the white wing patch.The wing patch on juvenile males is a great clue to their age and plumage stage, and changes quite a bit between late summer and their first spring. Freshly fledged there is no wing patch but juveniles undergo a partial moult before the autumn migration and crucially develops a pale or white wing patch. Females will lack ay wing patch and are more uniformly grey-brown.
There are thought to be typically 60-80 breeding pairs nationally with autumn migrants totalling several hundred to circa 1,000 individuals - total individuals recorded annually are therefore roughly 1,000-2,000 birds. They are highly localised with key areas are London and the Thames Estuary, Brisol and Severnside, Birmingham, and along the south coast.
I was able to locate various female type birds but always at distance and after a while of enjoying them through the scope we relocated down onto the coastal path, viewing one of the Severn Bridges in the distance. Although the light was still limited it was at least reasonably still. It took five minutes or so before we located a female but it was now closer and viewable through the fence. It then dropped down and into a dogwood shrub growing up a chain-link (wire-mesh) fence - this type of fence is common around industrial areas because it’s durable, affordable, and provides visibility while still creating a boundary.
We watched two females, a juvenile male and one male visit the fence around the dogwood and eventually observed them feeding on the dogwood berries - dogberries. Black redstarts are primarily insectivores, but their diet shifts seasonally to adapt to food availability. During the breeding season and warmer months, they focus on insects and other small invertebrates, which are rich in protein and essential for raising chicks.
In autumn and winter, insect numbers drop sharply, especially in northern or urban areas. To survive, black redstarts switch to fruits and berries, which provide sugars for energy and some essential nutrients. Dogwood berries, along with hawthorn, ivy, rowan, and other small fruits, are easy to find and digest, making them a convenient winter food source.
This seasonal flexibility is one reason black redstarts can survive in urban and semi-urban areas where insect availability may be unpredictable. They’ll often forage on berry-laden shrubs, supplementing their diet with whatever is available.
We enjoyed the views, and our earlier companion soon joined us, clearly noticing that we were getting better sightings than he had. Another birder appeared on the path as a kestrel flew around the cylindrical building structures, flushing pigeons from hidden perches. The kestrel made several passes, keeping the pigeons from settling, though they continued to circle the area. After a while, the kestrel seemed to give up its search and departed. It was evident that the peregrine, occasionally reported in the area, was not present today.
Charlotte had walked along the path and back and mentioned that she was beginning to feel cold, so we decided to pack up and head back to the car. On the way, we crossed paths with a birder coming the other direction, who confirmed spotting some female-type birds near our original vantage point. As we continued, we glimpsed a couple more ourselves, and a couple of stonechats.
We made our way to Slimbridge, which wasn’t far away, and on arrival we decided to postpone lunch until we had seen the Temminck’s stint that had already been reported that morning. We headed around to the Rushy Hide, only to find it full, with no spaces by the windows. Luckily, being tall, we were able to peer between others and try to catch sight of the bird. I was struck again by its size, particularly as it moved just behind a shelduck. Charlotte had a little trouble picking it out at first, with only directions and little sense of its scale, but she eventually spotted it, and we watched as it fed along a narrow muddy spit.
It is adapted for foraging in shallow mud and along the edges of freshwater wetlands. Its feeding behaviour is characterised by active probing and pecking. It mainly feeds on tiny invertebrates - insects, larvae, small crustaceans, and worms - which it picks from the surface of mud, sand, or shallow water.
Unlike some waders that use a rapid, continuous probing motion, Temminck’s stint often pause briefly between pecks, carefully inspecting the surface before striking. In winter or during migration stopovers, it will opportunistically consume tiny seeds or plant material, though invertebrates remain its main diet.
They breed across northern Europe and Siberia and winter in sub-Saharan Africa, South Asia, and parts of southern Europe. In recent decades, there are about 100 records per year, with around 70 of those in spring passage - the species is extremely variable year‑to‑year, partly because Britain lies on the edge of its migration route, which makes numbers highly dependent on weather and migration patterns. There was a reportedly low count in 2021 of 54 individuals and a record influx of at least 226 in 2004.
Scanning the rest of the water we could see that numbers of birds have not built to the level we would expect for the winter months. We did however see a couple of common snipe out in the open and three spotted redshanks. After just a few minutes the stint flew onto the near bank but significantly distant and perhaps midway between the Rushy hide and Peng Observatory. From there it relocated again but this time to the back of the pool. After a further ten minutes Charlotte decided this was the time for us to visit the Visitor Centre for lunch.
We had been listening to one of the volunteers describe bittern flights between the Zeiss and Van de Bovencamp hides, which seemed to heighten Charlotte’s eagerness to return to the reserve. There was also a reported sighting of a yellow-browed warbler in the bushes near the Kingfisher hide. We decided to head straight for the Van de Bovencamp hide, joining about half a dozen others scanning the grass, reeds, and pool beyond. On the way, we stopped to chat with some friends who had dropped by after playing golf at Celtic Manor over the past couple of days.
One of the birders mentioned seeing bitterns within the last 45 minutes, so we were hopeful that regular sightings meant we wouldn’t have to wait long. About 20 minutes later, a bittern took flight in front of us, heading toward the Zeiss hide and dropping into the reeds to the front left. I managed to fire off a couple of shots, though the bird was already passing before I could get the camera on it. We watched for signs of movement in the reeds, and noticed people in the Zeiss hide pointing their lenses, suggesting they might have had partial views.
Around 15 minutes later, a second bittern burst out from roughly the same area, this time closer. It caught the strong wind now blowing through the hide windows and sped off quickly, veering right and disappearing over the track behind us. I didn’t have time to get the camera on it, though I was the one who had spotted it first. Later, a birder dropped by and showed us a photo of the second bird flying straight toward him before turning and crossing the track.
We spoke with a few birders who had gone looking for the yellow-browed warbler but returned empty-handed; perhaps the bird had taken shelter from the now brisk wind. Deciding to wrap up the day, we headed back towards the Visitor Centre for a cup of tea before making our way home.
On the way, we bumped into Nick and Anne Truby, who had stopped by on their return from a birding holiday in Cornwall. Unfortunately, the trip hadn’t been as rewarding as they’d hoped, and both had been under the weather with colds - Anne was still feeling unwell. We chatted briefly before continuing on our way.
Year list: 244.
































































