Tag Archives: Dartford Warbler

Thursley Common after Lockdown

Four-Spotted Chaser, resting on Heather
Southern Marsh-Orchid Dactylorhiza praetermissa
Picture-Winged Fly on sandy path
Large Red Damselfly on one of the splendid boardwalks
Main lake in Thursley’s acid bog
Bogbean flowers emerging from the main lake
Pines and Heather – simple but special, compete with a Cuckoo singing, a Stonechat, and a Dartford Warbler

Spring Migrants at Thursley Common

Eriophorum angustifolium, Bog Cotton, a plant of wild, wet and rugged places

A bright, breezy, and much cooler day (16 C, not 29 any more) was just perfect for a visit to Thursley. Perhaps many of the dragonflies decided not to fly: I saw one Common Darter and (I think) one Brown Hawker, and nothing else, so anyone who went along hoping to see the Hobbies hawking for dragonflies by the dozen will have had a wasted trip (and indeed I saw several extravagantly camouflaged types with gigantic telescopes standing about looking very bored).

But everything else was in full swing. A Cuckoo called from the pinewoods. A Curlew gave its marvellously wild, bubbling call from the open marsh. A Dartford Warbler gave me the best view ever of its rufous belly and long tail, as it sat low in a scrubby Birch, giving its rasping anxiety call repeatedly. I enjoyed the view through binoculars. By the time I remembered to take a photo it was half-hidden again.

A scrappy photo of the Dartford Warbler

A Stonechat gave its scratchy call from a small Birch, then hopped up to some Pine trees (so, a distant shot).

Stonechat on Pine branch

A few Chiffchaffs called from the woods; plenty of Whitethroats sang from the regenerating Birches that are encroaching on to the heath. A Green Woodpecker gave its fine laughing call.

Birches regenerating on to heath below Pines

So I heard three warblers today to add to the four yesterday, so seven singing warblers in 24 hours, a little bit special.

The lichen flora on the heath was quite beautiful, with Usnea beard lichen, leafy Parmelia, bristly Ramalina (all on old Heather), and elegant Cladonia potscourer, cup, and stalk lichens (three species).

Miniature elegance: Cladonia cf fimbriata, cup lichen

A Linnet sang from the top of a Birch. Goldfinches twittered and flitted about.

Dove’s Food Cranesbill, Geranium molle, (?), on dry heath beside path

Musk Stork’s-bill, Erodium moschatum, (?) on dry heath beside path

And on the path out, a Hobby leapt from a tree right in front of me, where it had been sitting watching the bog pools,  waiting for dragonflies to come out and display themselves. It flew round and up, then circled, soaring, away to the south. Perhaps it was the one the twitchers had been waiting to see flying all morning.

Dragonfly Day at Thursley Common

Keeled Skimmers - male guarding, female laying
Keeled Skimmers – male guarding, female laying

It was suddenly summer again this morning, so I packed cameras, binoculars and a sandwich and went down to Thursley in glittering sunshine. This photo perhaps catches something of the dazzle and sparkle of the bog pools and their shimmering guardians: a pair of Keeled Skimmers (Orthetrum coerulescens) are flying over the water; she is darting down to lay eggs, he is hovering above, guarding her from other males. Their wings sparkle and flash, and it is amazingly difficult to follow, frame, focus and shoot fast enough to get anything like a decent picture. But I rather like the motion blur in this one, and if it’s not perfectly in focus, you know why. I hope you like it too.

Emerald Damselfly
Emerald Damselfly

I was pleased, too, with this shot of an Emerald Damselfly, the sparkling water behind it forming a pattern of pleasantly out-of-focus circles.

Small Red Damselflies in Wheel
Small Red Damselflies in Wheel

There were quite a few Small Red Damselflies about, mostly single but a few egg-laying pairs; and a modest number of blues, most likely Azures.

Apart from the hundreds of Keeled Skimmers, other dragonflies included Common Darter, Black Darter (I only saw a few females today), Black-Tailed Skimmer (just one), and Southern Hawker.

Large Skipper on Bog-Cotton
Large Skipper on Bog-Cotton

We saw few butterflies apart from Large Skippers which bustled about flowers near the boardwalk, and little Gatekeepers (I do mean they were smaller than usual) … until we arrived on the amazing Parish Meadow that was once a dump for emptying cesspits. Now it has an ecology strikingly unlike the rest of Thursley Common.

Centaury on Parish Meadow
Centaury on Parish Meadow

The meadow was full of Meadow Browns, Graylings (mating), Ringlets, Essex Skippers, a Brimstone, Large and Small Whites, and … a Purple Hairstreak (about the Oak trees). The rabbit-bitten pasture, dotted with little flower-stalks of Centaury,  was thick with Ragwort, which in turn was richly covered with Cantharid beetles, solitary bees, wasps, and hoverflies and other Diptera. We put up a Silver Y moth which obligingly landed in front of us and perched in the open. We found the traces of a Green Woodpecker killed by a Sparrowhawk; but happily saw a live one in the Oaks nearby.

Cantharid Beetles Rhagonycha fulva mating on Ragwort
Cantharid Beetles Rhagonycha fulva mating on Ragwort

Silver Y Moth
Silver Y Moth

Sparrowhawk Kill - this Green Woodpecker's flying days are over
Sparrowhawk Kill – this Green Woodpecker’s flying days are over

The boardwalks were busy with Lizards and Skimmers sunning themselves.

Lizard on boardwalk
Lizard on boardwalk

We met a local group of birders,  complete with masses of tripods, telescopes and cameras, and asked if they were looking at the Stonechats. No, they replied, the Hobbies, there are three. We looked up, and sure enough there were three raptors. But in our binoculars, they turned out to be a Kestrel, a Hobby, and a Red Kite! Perhaps there were some more Hobbies somewhere else.

A little way further, absent the birders, we found a dead tree with some juvenile birds perched about it, and a lot of twittering. Yeah, a typical Chiswick Cafe. Some of them were young Redstarts; the others, young Stonechats: pretty confusing. But the Redstarts flew up into a Pine tree – not a Stonechatty thing to do – and sure enough, there was an adult Redstart on a lower branch, plain to see. And a Stonechat adult rasped out its grating call over to the right.

In a group of tall Oaks, we sat and ate a sandwich; and a Spotted Flycatcher flew across and perched on a high dead branch. It spent five minutes looking about, twisting its neck remarkably, but making no sallies. When I was a boy I saw them in the garden every summer; now they’re really something special, like, er, Starlings and House Sparrows.

Meadow Grasshopper
Meadow Grasshopper

The sandy heath paths were full of little holes dug by Ammophila Sand-Wasps, and others made by Philanthus Bee-Wolves (or Bee-Killer Wasps). Both are called digger wasps (“Sphecidae”) in most books, and it’s certainly a good name, but the family has been split up, so Philanthus is now in the Crabronidae, which contains most of the old “Sphecidae” (we’ll have to say sensu lato for this); the new Sphecidae (sensu stricto) only contains what used to be the Sphecinae, which includes Ammophila. Rich scope for confusion.  Sphex is the ancient Greek word for wasp, and it’s interesting that Linnaeus chose this word for a digger wasp rather than the social wasps, which have the Latin name Vespa for the hornet, and Vespula, little wasp, for common wasps.

Bee-Wolf (Bee-Killer Wasp Philanthus triangulum)
Bee-Wolf (Bee-Killer Wasp Philanthus triangulum)

Bee-Wolf digging burrow. She will catch a bee and use it to provision her nest.
Bee-Wolf carrying a bee into her burrow to provision her nest.

Sand-Wasp Ammophila pubescens
Sand-Wasp Ammophila pubescens. She too digs a burrow which she provisions with a caterpillar or two. The sand is dotted with angular lumps of iron pan.

Out of a low bush of willow and gorse right beside a boardwalk came a strange, quiet but insistent squawky chatter of alarm. Peering in between the branches, a small slim dark bird with a long dark tail could be seen hopping about anxiously: a Dartford Warbler. It was extraordinary to be within a few feet of this shy, rare and retiring bird, and watching it for several minutes. There are actually quite a few on the heaths of Surrey and the south coast, but they’re never easy to see—most of my views have been of disappearing rear ends, diving into gorse bushes.