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:

2017_10_08Starl

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:

2017_09_17stoch
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

 

Ravensroost Meadows: Saturday, 16th September 2017

After our excellent session in the meadows two weeks ago, at Jonny’s suggestion we shelved the planned trip to one of the woodland sites and headed back to the pond.  The team was Jonny Cooper, David Williams, Neil Stockley, Steph Buggins and Lillie Woodley.  As we all (except David) had unavoidable engagements in the afternoon, the plan was to set fewer nets and pack up at 11:00.  As expected, we didn’t catch as many birds, but a major surprise was the complete lack of Swallows and House Martins in the catch.  There were plenty around, but they seemed to be approaching the ponds in a south / north direction rather than their usual east / west direction.  This rendered the causeway net virtually redundant.

It was still a good catch: Blue Tit 16(3); Great Tit 6(1); Marsh Tit 1; Wren 2(2); Dunnock 2; Robin 2(1); Blackbird 1; Blackcap 8; Whitethroat 1; Lesser Whitethroat 1; Chiffchaff 16(2); Goldcrest 1; Chaffinch 3; Goldfinch 4; Bullfinch 1.  Totals: 65 birds ringed from 15 species, 9 birds retrapped from five species, making 74 birds processed from 15 species.

The entire catch, apart from the Lesser Whitethroat and the two Wrens we ringed this session, were birds that fledged this summer.  For the second session running we caught a Marsh Tit at the site.  This, too, was a juvenile.  As the species is known to be highly sedentary, could this be an indication that all of the available territories in the nearby woodland are occupied and they are being forced out to find their own?

This will be David’s last session for a while, as he is off to start university in Aberystwyth next week.

Simon Tucker

Blakehill Farm: Wednesday, 6th September 2017

The weather forecast for Wednesday was for it to be a dry day with light westerly winds initially, strengthening throughout the morning, and changing direction from WSW to WNW by 11:00.  We decided that the session at Blakehill could go ahead, on the basis that the nets on the edge of the plateau could work until 10:00 and the hedgerow nets on the perimeter track would be okay until much later.  In the end, we had to take down the perimeter track nets at 11:00 and were packed up and gone by 11:40.  By 11:00 the birds had stopped moving around and the catch had died away to virtually zero.  However, up until then we had an excellent session.  The team for the day was Ellie Jones, Jonny Cooper, Andrew Bray, David Williams and myself.

Jonathan, the farms manager, and his team have done a great job of trimming the edge bushes of the central plateau.  They are compact and far less straggly, laden with blackberries – and just the right size for 9m and 12m nets: now, if the wind will stop blowing for a day or so!

Our first two rounds were quiet: a Wren and a Dunnock at 7:30, followed by two Goldfinch, a Blackcap and a Robin at 7:45. Then the Goldfinches arrived and we were very busy for the next two-and-a-half hours.  The highlights of the day were: our first Whinchat of the autumn and, at last, a reasonable catch of Long-tailed Tits: five ringed and five retrapped is our best return on this species in the Braydon Forest this year.​

The list for the day was: Swallow 4; Blue Tit 4; Great Tit 7; Long-tailed Tit 5(5); Wren 1; Dunnock 2; Whinchat 1; Robin 1; Blackcap 3; Whitethroat 3; Chiffchaff 4; Willow Warbler 1; Chaffinch 1; Goldfinch 35; Reed Bunting 2.  Totals: 74 birds ringed from 15 species, five birds processed from one species, making 79 birds processed from 15 species.  Only seven of those birds could be reliably aged as adults. Long-tailed Tit adults and juveniles have both generally finished moulting and their plumages as indistinguishable. We know the five retrapped birds are adults but, whilst we suspect the five we ringed were juveniles, it cannot be proven beyond doubt.  The mantra is to be “accurately imprecise, rather than imprecisely accurate” (credit to Richard du Feu for coining the phrase) so we code them as “age unknown”.

In amongst our Goldfinch catch was one with a single aberrant primary feather:

2017_09_06Goldf

It was just that one feather, and the aberration was not present on the other wing.

All in all, another very satisfying session: handled really well by the team.  With five competent extractors working together, we cleared the nets quickly and efficiently in every round. Had the wind not got up and changed direction we would probably have had another 100+ bird session.

Simon Tucker