Webb’s Wood: Saturday, 14th October 2017

Saturday was a perfect day for ringing: dull, overcast and virtually windless.  Jonny Cooper and I had a very good catch at Webb’s Wood.  This included our second earliest ever capture of a Lesser Redpoll:

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The earliest was at Somerford Common on the 13th October 2015.

However, the highlight of the session was a catch of three Marsh Tits.  Webb’s has always been a bit behind the other sites when it comes to these birds but three in a session is a real red letter day: it was one adult and two juvenile birds.  They have been colour ringed and, hopefully, a number of other birders will see them and give us reports back on where and when.

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This brings to five the number of Marsh Tits ringed in Webb’s this year, compared to one in each of the previous three years and two in 2013 when I started ringing there.

The list for the day was: Treecreeper 1; Blue Tit 8(1); Great Tit 5(2); Coal Tit 8(1); Marsh Tit 3; Long-tailed Tit 2; Wren 4; Dunnock 1; Robin 4(1); Goldcrest 16(2); Lesser Redpoll 1. Totals: 53 birds ringed from 11 species; seven birds retrapped from five species, making 60 birds processed from 11 species.

Amongst the birds retrapped was a Goldcrest, EXR483, that was ringed in July 2014.  What is remarkable about this bird is that juvenile mortality, whilst currently unknown, is likely to be similar to that of other small birds (70 – 80%) and adult survival is less than 15% (Blue Tit adults, for example, have a 40 – 50% survival rate).  Average lifespan is estimated at 2 years and the oldest known specimen is only 4 years 2 months and 24 days.  This bird, at 3 years 2 months and 26 days since ringing, is certainly a venerable example.

Simon Tucker

Somerford Common: Wednesday, 11th October 2017

Wednesday was a bit hit and miss as the forecast was for it to be very windy.  I was grateful that both Andrew Bray and Jonny Cooper turned out to help.  We had hoped that the projected wind direction would enable the wood to provide enough cover for us to set our nets in the usual places.  Unfortunately, the forecast direction turned out to be incorrect and we had to set most of the nets in less than optimal places.
However, we did manage to catch some birds:
Blue Tit 6; Great Tit 2(3); Coal Tit 3; Long-tailed Tit 1(1); Wren 1; Robin 2; Redwing 1; Chiffchaff 1; Goldcrest 1; Bullfinch (2).  Totals: 18 birds ringed from nine species; six birds retrapped from three species, making 24 birds processed from 10 species.
The birding highlight was our first Redwing of the winter.  It is our earliest capture of a Redwing to date, by two days.  However, my highlight of the session was a beetle:
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I haven’t seen a Devil’s Coach Horse for years, and this beastie stayed around for quite a while and posed beautifully.
Simon Tucker

Blakehill Farm: Sunday, 8th October 2017

With yesterday’s scheduled session being rained off, Jonny and I met up at Blakehill Farm this morning for a shortish session. I think Jonny was pleased to have an extra day to recover from his trip to the Shetlands, from which he returned on Friday.  All he managed to see there were a few common birds: Red-throated Pipit, Little Bunting, Rustic Bunting, Red-Breasted Flycatcher and Buff-bellied Pipit, his second Parrot Crossbill didn’t merit a mention. (Yes – I am joking; Yes – I am jealous).

As the central plateau is currently being grazed and there was cattle everywhere else on the site, we kept our session to the area in front of the Whitworth Centre and along the footpath to the pond area.  The session started well, with a nice flock of Long-tailed Tits in the net directly opposite the Centre. We processed them, and then set a couple of two shelf nets on the opposite side of the hedge lining the perimeter track and put on a lure for Linnet.  For the rest of the morning we watched Linnets flying up and down the hedgerow looking for this noisy con-specific. Unfortunately, only two of them managed to blunder into our nets.  Given how few have been seen at Blakehill this year, we were pleased to see quite so many this session.  This one was a little camera shy.

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Soon after we had set the Linnet net, I heard the pounding of footsteps and watched Jonny haring across the field to the net on the far side of the field.  He came back with this beauty:

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This is a juvenile female Kestrel.  She was extremely feisty and we both have a few wounds as a memento of the occasion.  Jonny won’t mind: it was the first Kestrel that he has processed.

As we both wanted to be away before 13:00 we did our last round at 11:15 and I was delighted to take two of these lovely birds out of the same net that previously caught the Kestrel:

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Following on from the five that I took out of the plateau nets on my last session, it has been a real privilege to handle some of my absolute favourite birds.  These birds were juveniles, in the last stages of moulting out their juvenile plumage, with just a few buffy feathers on the head and neck area.

The list for the session was: Kestrel 1; Blue Tit 1; Great Tit 2; Long-tailed Tit 6; Wren 4(1); Robin 5; Goldcrest 3; Starling 2; Goldfinch 1; Linnet 2.  Totals: 27 ringed from 10 species and one retrapped bird.  Unusual for Blakehill Farm, we caught no Dunnocks or Reed Buntings.  These are generally the most regularly caught birds on the site.

Whilst I was looking at the figures for this blog, I had a particular look at retrapped birds, as catching just one at a regular site is unusual.  Since I started ringing independently, me and my team have ringed 13,283 birds and retrapped 3,899. So our retrap rate is running at a pretty good 22.7%.  Resident species are, obviously, the most likely to be retrapped and that proves to be the case:

retrap ringed total % retrap
Marsh Tit 125 91 216 137.4%
Coal Tit 239 336 575 71.1%
Long-tailed Tit 338 650 988 52.0%
Dunnock 171 349 520 49.0%
Great Tit 589 1261 1850 46.7%
Robin 346 849 1195 40.8%
Wren 190 506 696 37.5%
Blue Tit 850 2372 3222 35.8%
Blackbird 151 467 618 32.3%
Bullfinch 59 230 289 25.7%
Song Thrush 37 153 190 24.2%
Reed Bunting 22 118 140 18.6%
Chiffchaff 165 933 1098 17.7%
Blackcap 166 965 1131 17.2%
Willow Warbler 35 253 288 13.8%

Obviously a bird is ringed only once, but a ringed bird can be retrapped on multiple occasions.  The Marsh Tits are so sedentary, and as we tend to set our nets in the same places in our sites, there is a much higher incidence of repeat captures of the same individuals in the same place on different occasions, hence the slightly odd statistic. What surprised me most was that Blue Tits are only eighth in the list.  Being the most commonly caught bird, and we always seem to be picking up retrapped Blue Tits, I assumed that they would have the highest proportion of recaptures.  Evidently not.

Migrant warblers, quite naturally, are the least frequently retrapped but two out of every eleven is not a bad return.

Simon  Tucker

Lower Moor Farm: Wednesday, 27th September 2017

Lower Moor Farm is our BTO Constant Effort Site.  Over the course of the breeding season, from May to September, we set the nets in the same places for twelve separate sessions, roughly ten days apart.  This enables us to monitor changes in the bird population knowing that it is independent of net position.  Once that is over I like to try nets in different parts of the site, to see what else we might find.  I was joined by Ellie Jones (the Reserve manager) and Jonny Cooper for the session.  We put up three different sets of nets, as indicated on the photograph below:

Lower Moor

The two new net sets were those in white and yellow, the brown set is one of our CES rides, which we set to ensure that we had some birds to process.  In the event, that was a wise decision.  Having put most of our effort into setting up the white set, it was a complete flop until five hours later, when we were doing the the last round, when it delivered a Goldfinch and a Blackcap.  Scant return for the effort.

The yellow net set was positioned through a large group of teasel plants and, as hoped for, it delivered a catch of seven Goldfinch and a Robin.  Our usual net ride helped make us feel as though we hadn’t completely wasted our morning with a catch of  Blue Tit 2(1); Great Tit 1(2); Wren 1(1); Robin (1); Blackcap 5; Chiffchaff 4; Bullfinch 1(1).  In total we caught and ringed 24 birds from eight species; retrapped six birds from five species, making 30 birds processed from eight species.

On the Tuesday afternoon I went for a walk around a part of the reserve not open to the public, to assess whether or not it would be suitable for setting some nets.  Unfortunately, it isn’t, primarily because the access is not great.  Whilst I was on my walk I came across two rather interesting sights.  The first was clear signs of Beaver activity:

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The second was this enigmatic lump of orange bubbles:

trout roe

I was pretty certain I knew what it was, but confirmed it with one of the local anglers: it is the egg roe from a female trout.  Evidence that the local Otters are enjoying the stock in Mallard Lake.

Simon Tucker

Blakehill Farm: Friday, 22nd September 2017

We have had a couple of cracking sessions at Blakehill recently but noticed that there was quite a lot of activity outside of our usual netting area; so Friday morning I decided to try out some other net positions to see if those movements would translate into catches.

Unfortunately, none of my team or the wider ringing group was available to help. It was, therefore, quite a slog getting all the nets set and I didn’t get them open until 8:00. Fortunately, the mist didn’t start burning off until just before then. The good thing is that all of the new net positions caught. The first new net delivered 3 x Whinchat and a Stonechat in the first round and nothing else – but that will do nicely. 

Over the course of the next three hours I extracted 64 birds from 13 species: Swallow 2; Blue Tit 8; Great Tit 6; Coal Tit 1; Dunnock 4; Meadow Pipit 17; Stonechat 3; Whinchat 5; Blackbird 1; Chiffchaff 10; Starling 5; Reed Bunting 1 and one solitary retrapped Wren.

It was hard work but great fun and I think I fulfilled enough of the government’s new 10 minutes brisk walking target to last a month.  The catch was interesting for all sorts of reasons. For example, six of the Blue Tits were caught in the small bushes on the plateau and not in the hedgerows lining the perimeter track.  I caught the first Coal Tit for the site.  Catching another five Whinchat brings the annual total to six: better than last year but still need another to match 2015.

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The catch of three Stonechat seems to be the norm for these birds at Blakehill but, outside of the first of the species caught here, a singleton in September 2015, this is the earliest multiple catch of this species so far.  Hopefully we will get similar numbers in October and November as we did in 2016.  All of the Whinchat and Stonechat caught were females.  The Stonechats were all juveniles whereas only one of the Whinchat was.

The remarkable run of Meadow Pipits caught continued, with another 17 finding the allure of the call on the MP3 player irresistible.  That takes us to 47 for the year: quite an astonishing number given the previous annual totals.  There seems to be so many more on site this year than previously.

The key thing is that we now have the possibility of using a number of alternative net positions that we can be confident will deliver a catch.

Simon Tucker

Tedworth House: Wednesday, 20th September 2017

Before the start of this year, only twice had we caught more than 20 birds in a session at Tedworth House.  We have caught spectacular birds there: particularly Firecrest and Black Redstart; and a host of birds not often caught in mist nets: Mistle Thrush, Kestrel, Sparrowhawk, Magpie, Jay, Jackdaw, Woodpigeon and Mallard.  Since the start of 2017, however, we have seen a much higher catch level than in previous years.  This culminated in this month’s session, which produced a total of 49 birds.  The biggest catch to date.  We didn’t change the setup much from normal: I actually set fewer nets than I usually do and tried one new net position that yielded no birds, so I won’t use that again.

As I have mentioned before, the brief at Tedworth House is twofold: to inform the staff, residents, visitors and volunteers at the House and help bring them closer to nature and secondly, to monitor the impact of the management of the woodland under the auspices of Dave Turner of the Wiltshire Wildlife Trust.  The really encouraging thing about the increase in the catch this year is that it has been achieved largely without artificial feeding. In previous years the only way to attract numbers of birds to the catching area has been to provide feed for several days in advance of the session. This year there has been very little feeding and yet the catch has improved significantly.  Hopefully this means that the woodland management is producing increased natural food availability.

One plan for this winter is to dig a large wildlife pond.  This should produce an immediate benefit for all of the local wildlife, and can only be good news for the bird population.

The list for the day was: Blue Tit 11; Great Tit 5; Coal Tit 2; Dunnock 5(1); Robin 2(2); Blackbird 3(1); Blackcap 3; Chiffchaff 5; Goldfinch 1; Greenfinch 8.  Totals: 45 birds ringed from 10 species, four birds retrapped from three species, making 49 birds processed from 10 species.

The Greenfinches make a good story.  The maintenance man at Tedworth House is the wonderfully named Jack Daw.  As befits someone with that name, he is a keen birder and ringer.  His speciality, par excellence, is nest finding and pullus ringing.  He monitors the nests found on site and this year Jack found Greenfinches nesting. When he found the nest the birds were already too advanced to ring.  That is his great skill, apart from finding nests in the first place, recognising when it is inappropriate to ring the occupants of a nest, so they don’t prematurely abandon their place of (relative) safety.  So we knew they were there, but that doesn’t mean we will catch them.

Since I started ringing at Tedworth, until the beginning of this year, I had caught just one Greenfinch on site: a juvenile bird in May 2015.  We caught two in August and, now, with another eight, ten for the year. Of those ten, three were adult birds (one male and two females).  Hopefully this could be the start of a new population establishing in the area.

The woodlands and grounds of Tedworth House are, perhaps, the most enigmatic of my sites: you just never know what will turn up.

Simon Tucker

Blakehill Farm: Sunday, 17th September 2017

We don’t usually do sessions on both days of the weekend but, with another calm day forecast, Jonny, Steph and I decided to have another go at Blakehill Farm.  The hope was to catch some migrants moving southwards on the northerly winds that featured at the end of the week.  In the event, it became an excellent catch of one particular resident species: Meadow Pipit.  In the last two years we have caught 14 of them at the site in the month of September: today we caught twice that.

We hadn’t planned for this: the plan had been to target any Wheatear that might be about and we had set a lure to attract them in to a number of Potter traps baited with some nice, juicy maggots.  There was no sign of any Wheatear, but all of a sudden a flock of Meadow Pipits appeared.  I changed the call to Meadow Pipit, and they found it irresistible.  The Potter traps failed miserably, not catching a single bird, but we strung a net behind the traps and it caught 26 of the 28 Meadow Pipits processed.  One of the things about Meadow Pipits and nets is their habit of sitting on the top strand of the net or on the supporting poles.  Today, a couple of them actually perched on one of the lower strings, the ones that create the pockets with which we catch the birds. Usually birds are caught by hitting the taught net at speed and dropping into the pockets made by the horizontal shelf strings.  What we didn’t expect was these two who sat there and simply toppled forward into the pockets.

The morning started brilliantly for me.  As I arrived on site and parked up, my headlights picked up a Little Owl sitting on a fence post at the entrance to the central plateau.  It flew off when I opened the car door, but circled round to land on another fence post 50m away and stayed long enough for the others to see it.  This is the first I have seen at the site: it is certainly not a regular at Blakehill Farm.

The list for the morning was: Swallow 11; Blue Tit 3; Great Tit 4; Wren 1; Dunnock 1; Meadow Pipit 28; Stonechat 1; Robin 1; Blackcap 4; Lesser Whitethroat 1; Chiffchaff 9; Reed Bunting 3.  Total: 67 birds ringed from 12 species.  As is par for the course, the bulk of the birds were juveniles: the Dunnock, two of the Reed Buntings and six of the Meadow Pipits were the adults.

It was a pretty good session for Steph as well: she got to ring her first Meadow Pipits and  this lovely juvenile, female Stonechat:

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Photo courtesy of Steph.

We were happy to catch another 11 Swallows, but it was a tiny fraction of them on the site. At one point there were several hundred sitting on the fences lining the fields to the east of the central plateau.  They flew around and over the nets but just a few managed to misjudge the distances and drop into the nets.

The wind started to get up about 11:00, somewhat later than forecast, and to avoid the problems of extracting nets from hedges, we started to take down soon after.  All in all, it was an excellent session.  There was so much activity on the central plateau that I cannot wait to arrange another session on the site: the next calm day will see me back there.

Simon Tucker