David Bradley – Page 38

Grasshopper Warbler, Locustella naevia

If you’ve never seen or more to the point heard a Common Grasshopper Warbler, Locustella naevia, then a visit to East Anglia right now might be merited. There are quite a few noted in our local countryside and on nature reserves (April 2022).

They’re summer-visiting migrants and will depart in August. The male’s song, isn’t so much a melody as a churring, turring, reeling tone reminiscent of the sound made by grasshoppers.

I was lucky enough to catch sight of one this morning and with a decent-sized zoom lens it didn’t mind me recording a snippet of video while it reeled. I used an audio editor to add a low cut (high-pass filter) and a high cut (low pass filter) that bracketed the bird’s sound to isolate it from the noise of the gravelworks, wind, and aeroplanes. You can see the spike that is the warbler’s reeling on the right of the image, the mound of noise on the left is rumbling works and wind.

Nearby where the street has a name…

Photographing butterflies

When the first Orange Tip of the garden year turned up just moments ago, I grabbed the nearest camera and rattled off a quick burst when it landed briefly on a wildflower (weed) in the garden. Pre-programmed settings on a Canon 7dii with a Sigma 150-600mm lens pulled to 600mm. 1/1600s, f/8.0, auto ISO jumped to 1600. No chance to do any bracketing or exposure compensation, before this male had flown. So, thank goodness for shooting in RAW.

RAW mode saves all the data your camera’s sensor detects. There’s no processing in the camera, you have to pull the RAW file into appropriate software and convert it to a format that you can then edit with a photo editor. In this case, I opened the native RAW importing component of PainShop Pro. This, like almost all other RAW software, lets you choose the exposure compensation after the fact so that blownout whites like one would get with an Orange Tip butterfly can be rescued.

So, as you can see in the above before and after shot, I’ve set exposure compensation (highlight recovery, they call it in this software) to “normal” and it’s rescued some of the blownout details of the white part of the butterfly’s wing. RAWTherapee, Lightroom, and other tools let you do more sophisticated imports of RAW files. And, you can rescue the blacks too and then create a pseudo-bracketed shot or even an HDR if you wish with some software.

Once some rescue work has been done, I’ll usually then apply a few different adjustments to levels, clarity, vibrancy, and sharpness, as well as cropping and adding my logo.

Ukraine’s National bird, the White Stork on our local patch

TL:DR – The national bird of Ukraine is the White Stork (Ciconia ciconia), we occasionally see them in the local fenland. Often they are ringed birds or birds that have escaped into the wild from collections.

I went looking for a White Stork (Ciconia ciconia) that had been seen at the marina in the nearby village Earith this morning. I was lucky enough to catch sight of it on the wing circling with numerous gulls and several Grey Herons before it headed upstream and out of sight along the Great River Ouse.

As many readers will know, the White Stork is the national bird of Ukraine, feels rather poignant to have seen one today. Birdwatcher Oleksandr Ruchko writing in The Guardian from Lviv had this to say on seeing the birds return to his homeland:

The stork is very sacred to Ukrainians, a symbol of spring, of babies, and of peace. They are believed to be a kind of amulet, and protect your house against evil. Nobody here ever kills storks to eat, not even in the worst times

The White Stork is widespread on the continent and a bird of fable and legend even to this day in the British Isles despite our having driven it to extinction in the middle ages. Last nesting pair was observed in Edinburgh in 1416. Today, there are a couple of dozen seen sporadically in the UK, some will have come from collections. The one I saw today was unringed but well have been released from a breeding program or other place. Equally, it may well have arrived from continental Europe…perhaps even Ukraine, itself, no way to know for certain.

Meanwhile, I also went back for another look at the Garganey and female Blue-winged Teal on the flood. I caught the Garganey in flight and was rather hoping that I’d inadvertently caught the female Blue-winged Teal in flight too. But, it his looks like a female Garganey chasing a drake Garganey. Funnily enough, the drake has quite a reputation having mated on several occasions over the last few weeks…with the female Blue-winged Teal. So maybe the female Garganey has taken umbrage…hah!

The Garganeys are thought to have headed north from Spain when it got too dry for them there early in the year. There have been lots of reported sightings of this bird in the UK in the last few weeks. The Blue-winged Teal dropped in not long after a Green-winged Teal had already been sighted. Those are both American birds that should really be heading south for Texas not Cambridgeshire, but presumably chose the wrong line of latitude when they set off from The Arctic earlier in the year.

After the garganeys, I spent some time watching Whitethroats, tried to get a photo of one of the Cetti’s Warblers, snapped a Sedge Warbler, and spotted my first Orange Tip butterfly of the year.

A scarce flower for Passover and Easter

We took a walk along the Devil’s Dyke hoping to see Green Hairstreaks and perhaps the Dotterals that had been sighted on neighbouring Ditch Farm. We had no luck with either of those, although there were lots of Brimstone butterflies, a few Whitethroats, and our first Willow Warbler of the year.

Almost in passing we noticed a pretty purple flower with a yellow centre. Mrs Sciencebase suggested it might be some kind of anemone and it is indeed in the same sub-family, Ranunculoideae, but it is specifically Pulsatilla vulgaris, known colloquially as the European Pasque Flower. Pasque from the Hebrew word for Passover, Pasakh. Obviously, quite apt for this time of year.

The plant is also known as the wind flower, prairie crocus, Easter flower, and meadow anemone. The showy purple parts are sepals rather than petal. It’s a scarce plant that likes chalky or limestone-rich land. Happily, the very substance of the raised earthworks that is Devil’s Dyke is a good proportion of chalk. It is also the ‘county flower’ of Cambridgeshire and neighbouring Hertfordshire. Pulsatilla species are toxic and can cause vomiting and diarrhoea if ingested and in serious cases of poisoning, convulsions, a critical drop in blood pressure, and coma.

Thanks to Twitter friends for the ID, one, to my chagrin, I did not know.

Counted 11 hares on adjacent farmland, lots of cowslips, lots of Brimstone butterfly, one or two Small Tortoiseshell, half a dozen European Peacock and lots of the same beige moth (perhaps a caddisfly?)

Manchester street photography and architecture

There’s actually not much difference between snapping wildlife in the countryside and human activity in the city to be honest. You have to blend in and sort of camouflage yourself, hiding in plain sight so that your subjects don’t really notice you’re there.

So, on a trip to Manchester, I swapped my green waterproofs and trek-shoes for a mostly black outfit and my zoom lens and dSLR for a phone. And, while Mrs Sciencebase and daughter were doing some post-graduation shopping, I leaned against a few lampposts and some other street furniture and and got a few candid shots of Manchester and its daylife.

An American vagrant in Earith

I’ve been a bit under the weather with something other than covid but it’s had me stuck indoors for a few days nevertheless. I stoked myself up on some appropriate medication and ventured out to see the Black Redstarts, the Garganey, and the Blue-winged Teal that have all turned up on a fairly local patch (a fenland village currently with a lot of flooding).

There were lots of birders around with big scopes and a few toggers. Some of the birders is toggers too (to paraphrase Ice-T). Speaking of which, one of the birders that you can’t see in the photo told us he had covid, although thought he was probably past being infectious, I kept well away from him, the silly boy!

I latched on to one birder whom I recognised, he was well away from the crowd and had been there for about 5 hours, I asked him for guidance as to the whereabouts of the Garganeys and the Blue-winged Teal.

The Garganeys, which seem to have turned up in the British Isles in fairly large numbers from Spain recently, perhaps because of unusually dry weather there, were fairly static, but feeding and dabbling at a distance from the footpath of about 250 metres. More intriguingly a Garganey drake (Spatula querquedula) was on the far bank, roosting on a log, and right next to it the American vagrant. A female Blue-winged Teal.

Garganey drake and female Blue-winged Teal (trust me, it’s there, I saw it through a ‘scope)

The Blue-winged Teal (Spatula discors) is a duck that you normally only see in North America, Central America and the very northerly parts of South America. Intriguingly though our friend the Garganey drake, which is in the same genus as the blue-wing had been observed mating with this female earlier in the week. And, according to the expert was spending a lot of time with her. Another of the Garganey drakes, or maybe the same one, had also been seen mating a female another species in the same genus, a Northern Shoveller (Spatula clypeata).

As to the Black Redstarts, apparently, there was only one around, but I caught sight of it as it popped up to catching a flying invertebrate from the distant roof of a house beyond the village marina. No photo though. Sometimes just a birder and not so much a togger.

What do Peregrine Falcons eat?

What do Peregrine Falcons eat? It might be easier to ask what don’t they eat? Here’s a list of kills reported based on avian remains and feathers at the foot of the tall buildings frequented by the Cambridge Peregrines:

Bar-tailed Godwit, Blackbird, Black-tailed Godwit, Carrion Crow, Collared Dove, Feral Pigeon (Stock Dove), Fieldfare, Golden Plover, Great Spotted Woodpecker, Great Tit, Grey Partridge, House Sparrow, Moorhen, Redwing, Robin, Shoveller Duck, Starling, Teal, Woodcock.

The Peregrine Falcon (Falco peregrinus) is the world’s fastest animal. It stoops on its prey from way above and has been recorded as reaching speeds of an incredible 300 kilometres per hour. It basically slams into its prey to kill it and carries it off to a perch where it will pluck the bird before eating. It will also cache chunks of prey on tall buildings around its territory to eat later or for feeding nesting partner, and later chicks.

Creating large plasma bubble between electrodes

Occasionally, I like to mention some of the search terms that bring new visitors to the Sciencebase website. One of those phrases that intrigued me somewhat is this:

creating large plasma bubble between electrodes

Now, I can half imagine it’s someone looking for information about a physical phenomenon, perhaps for a school assignment or maybe a research project. So, what were they looking for?

Plasma is often referred to as the fourth state of matter – after solid, liquid, and gas. It is most similar to a gas, but rather than being made up of neutral atoms or molecules, it is fully ionised. This means that every atom in the gas has been stripped of its electrons. A plasma therefore comprises ions, charged particles, and free electrons (negatively charged particles) rather than atoms or molecules.

We think of it as being the fourth state of matter, but there is an argument for calling it the first state of matter given that plasma is the most common state of matter across the universe, such as the core of stars, nebulae in space, the aurora borealis. That said, we do not tend to encounter it in everyday lives except in specific small-scale circumstance because plasmas form only at extremely high temperatures or in very strong electric fields.

One of those small-scale situations involves the formation of a plasma between electrodes. More specifically, a plasma bubble can form in the electric field between two electrodes as the field strips away electrons away from the atoms of a gas. The size of the plasma bubble depends on a number of factors, including the voltage applied, the distance between the electrodes, and the type of gas that is being ionised by the electric field. Scientists experimenting with plasma bubbles can adjust these parameters, to create plasma bubbles of different sizes and shapes.

Glossy Ibis looking glossier

UPDATE: Breeding season 2023. In 2022, I mentioned the hope and possibility of Glossies breeding in the UK. This happened in 2023.

I’ve mentioned the Glossy Ibis many times before, there are still several in and around our local patch and almost 200 estimated to be across the British Isles. There were just four at a place where I’ve seen seven recently, but that’s fine. Four is better than zero.

They were all looking rather glossy, which is presumably in time for the breeding season. Whether or not these birds actually breed here is another matter. There is a breeding colony in Spain, but this African/Mediterranean species has been extending its range and hanging around the British Isles recently, but no reports of breeding or attempts at breeding just yet.

Maybe 2022 could be the year for it! Certainly, other recent acquisitions like Cattle, Great White, and Little Egret are in on the act.

Eurasian Crane, Grus grus

I’ve talked about the Common, or Eurasian, Crane on the Sciencebase site before, there are increasing numbers of this bird to be seen on our East Anglian patch, and that’s a very positive, natural thing.

There is something quite primaeval about the species. Snapped here with a 600mm Sigma zoom on 2/3 crop sensor Canon 7Dii from about 370 metres. I didn’t know ahead of the visit that they were even there and snapped them when I saw them and left them to their own devices.

Aperture f/8 shutter speed 1/1579s, ISO 1000. RAW image imported with Rawtherapee, denoised and sharpened in Topaz DeNoize AI, and final output tweaked with PaintShop Pro. Cropped to 40% original pixel-width.