24 May 2023

Strange goings on at Mullion Island

We took the opportunity of a fine evening to do a quick Great Black-backed Gull nest count on Mullion Island yesterday. Quite bizarrely, almost the first breeding bird we saw on landing was this Canada Goose, which actually had a nest with six eggs.

Nest with a view!

This is the first time we've even seen Canada Goose on the island, so quite a aurprise. At the other end of the island, we also found a second pair, but with an apparently failed nest with just one egg found near the empty nest.

As for the gulls, we covered most of the island, bar two areas close to nesting Shags, with a final count of 64 nests (178 eggs/chicks). Most were clutches of three eggs, some of which were just hatching, with just two small chicks seen.

Surprisingly we only saw one colour-ringed bird (L:DD2), which was a chick ringed on the island in 2018. Since then, it's been on its travels, seen on Ares beach in northern Spain in January, September and December 2020 and then at the nearby Playa de Santa Cruz in January 2021, so nice to see it back breeding.

Coincidentally, on a non-birding kayak earlier in the day (but always with camera at hand) we also recorded L:DD1 near Rosemullion Head, which is the first time it's been seen since being ringed on the island in 2018.

18 May 2023

Herring Gull and Kittiwake wanderings

We've not blogged anything for a while, but with a quiet winter devoid of Siberian Chiffchaffs there's not much to report! But this week we've had a couple of exciting colour ring sightings, so thought we'd share.

On 4th May we heard from the assistant warden at the newly-accredited Lundy Bird Observatory, with news of one of our blue-ringed Herring Gulls; W:377, which was ringed as a chick on a roof at Tregoniggie Industrial Estate, Falmouth in June 2020. It is a bit of an explorer though, having been seen locally until August 2021, before being report on the French coast in February 2022. The next winter (January 2023), it was reported from a French landfill site, before returning to the coast in March. It was last reported there on 6th April before swapping France for Lundy.

W377 at Stithians in August 2021
W377 at Marais de Suscinio in February 2022 (Catherine and Michel Marcaul)

Newly-moulted W377 back at Marais de Suscinio in March 2023 (Anne-Sophie Hochet)
W377 on Lundy in May 2023 (Luke Marriner)

Then on 15th May, we had a report of one of our Trewavas Head Kittiwakes, seen pair bonding and attending the beginnings of a nest maintenance on Skellig Michael, Co. Kerry, Ireland. KJ was ringed as an adult at Trewavas Head in 2017 and bred there (when the site was doing well) until 2020. As the main site started to fail, it then moved a short distance along the coast to Trequean Zawn in 2021, but then wasn't seen in 2022.

KJ on its travels (Brian Power)

We rarely see movements between our sites and Wales/Ireland as it's far more likely for us to share birds with the French colonies. In fact, this is our first Kittiwake to be found in Ireland and only the second Cornish-ringed bird to make the trip.

19 October 2022

Barn Owl 2022 update

It's been a strange summer for lots of our regular projects, with freak weather, bird flu and remnants of Covid still making life difficult. Some of our birds have fared particularly badly, with Kittiwake reduced to just one successful sitre across Cornwall, a crying shame.

Our Barn Owl monitoring continued pretty much unaffected though and despite the drought, birds actually seemed to do OK. The project continued to grow and we personally visited over 100 boxes for the first time, which is no mean feat. Despite clutch sizes being nothing special, birds survived quite well and were about average.

2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022
Sites visited 34 32 44 41 47 64 85 87 106 93 112
Unoccupied 7 12 11 11 12 23 34 36 43 35 34
Occupied, no breeding 2 7 7 7 8 5 4 3 4 5 4
Average clutch size
(where observed)
4.1 3.6 4.6 4.6 4.6 5.3 5.2 4.7 4.6 4.5 4.5
Average brood size
(where observed)
3.1 2.4 3.5 3.5 2.8 3.0 3.3 3.0 3.2 2.8 3.1
Chicks ringed 46 20
63 70 47 90 132 119 177 133 189
Adults ringed/recaught 11/9
3/4 9/13 17/8 14/9 21/14 18/14 16/15 22/17 19/17 20/22

It did seem that pairs along the north coast fared the best though (average brood size of 3.7), followed by Lizard and Penwith (3.4), central Cornwall (3.0), whilst those in the east of the county suffered most in the dry weather (just 2.3).

We continued our run of bizarre movements as well, with a non-breeding male (with a regular female) in an established site in Penwith having been ringed as a chick in 2017 in Northumberland. This is our furthest movement to date (at 587km) and it'll be interesting to see if it stays to breed now.

We sadly also received three reports of ringed birds dead on the A30 during the year, all on the open dual carriageway between Carland Cross and Fraddon. Along with a bird that had to be put to sleep after becoming tangled in a barrbed wire fence, this was a poor year for our chicks.

17 April 2022

Portreath Kittiwakes

With spring migrants back in earnest and everything singing and nest-buiilding, it was a good time to have another look at the Portreath Kittiwakes.

Probably only 75% of the birds were back on ledges, with plenty of space left to fill, so hopefully birds just aren't settled yet. Despite the sun, a bit of hazy sea fret made life a bit difficult ring-reading but we still managed to pick up three of our regular French-ringed birds.

OBM-WLN was ringed as a chick at Pointe du Raz in 2011
and has been seen regularly at Portreath ever since

RYM-ROO is a 2014 chick, first seen at Porthmissen (near Padstow)
in June 2018, then at Portreath in July 2018 and regularly since

The third bird avoided being photographed, but NRL-ROM was a 2015 chick and has been at Portreath since 2018. All useful information of course on how our birds roam around the Channel between breeding sites, so fingers crossed this will be the start of a productive season.

22 March 2022

So the breeding season starts

With the run of fine weather this week, it's the perfect chance to have a first look at some of our breeding seabirds. First stop yesterday was Mullion Island, where a few photographs from the cliffs revealed that the Cormorants were well into the breeding season, with some nests even having half-grown chicks exercising their wings. A scan of the photos revealed at least 69 nests, which is on a par with last year's record 73 nests.

We then sat on the cliffs overlooking Rinsey zawn and waited patiently for sitting Shags to shuffle and show us what they're up to. In total there were 11 occupied nests, but of these just one had laid, with three eggs present. This compares to well to previous years, with first eggs noted (from 2013-19) on 8th March, 22nd April, 13th March, 1st April, 22nd March, 9th April and 25th March.

2 March 2022

Storm Eunice delivers a lost swan

Storm Eunice brought a fair amount of destruction to the southwest, but there was one arrival that was a rather unexpected. When going out onto their farm near Lelant, one family were surprised to find an exhausted young swan in one of their fields. They picked it up and found that it was ringed, with both a metal ring and a yellow colour ring: CDBH.

CDBH recovering on a Cornish farm (Selena Richards)

With a bit of detective work, it was found to be a bird ringed as a cygnet in a park in Dublin in September 2021. It was quite happily seen in the park over the winter, last seen on 4th January, but then perhaps got caught up in the storm and ended up in a Cornish field on 24th February. The Dublin project has ringed 800 Mute Swans since 2015 but have never before had a sightings in England. The 353km this bird travelled (wind-asssited) is also a record for the project.

This is the first record of an Irish Mute Swan in Cornwall and in fact there have been very few ringing records of Irish Mute Swans making the Irish Sea crossing at all. There have previously been eight records in England (strangely mostly in and around the West Midlands), five in wales and two in Scotland.

Many thanks to Selena Richards and family for finding and reporting CDBH, Mark Whittaker for tracking it down and Graham Prole from the Irish Midland Ringing Group for the quick reply with the details.

13 February 2022

Our ninth Herring Gull visits France

Perhaps it's the fact that the weather is so wet and windy in Cornwall at the moment that another of our juvenile gulls has made the trip across the Channel to France. On Friday, W:377 was seen on the southern coast of Brittany near Sarzeau, loafing on a raft (for terns) with other juvenile gulls.

W:377 at Marais de Suscinio

Ringed as a chick in Falmouth in 2020 it hasn't been far before, last seen at Stithians Reservoir in August last year. See below it's short history, very helpfully prduced by the app created for us by Stephen Vickers, which you can use to report gulls to us here.

This is the ninth of our colour-ringed birds to have been seen in France, so it'll be interesting to see if it returns in the spring. Many thanks to Catherine and Michel Marcaultfor reporting W:377 and also for the photos.

W:377 at Stithians Reservoir in August 2021

27 January 2022

Sibe Chiff overload at the sewage works

The middle of January 2022 saw the first spell of cold, calm weather, perfect to start our winter ringing at our local sewage treatment works (STWs). These sites are a haven for insects in the cold weather and where there are insects there are always going to be birds. In winter, the resident wagtails, Wrens and Robins are joined by large numnbers of Chiffchaffs, including Siberian 'tristis' Chiffchaffs, possibly from as far east as the Urals. Once considered a rarity in the UK, it's now become more apparent how frequent they are, especially in the far southwest.

Over the week of cold weather we managed to ring at four of our regular sites, all of which produced plenty of birds. We've ringed at these sites for several years, so recatching birds from previous winters is always interesting and it's rare to see a bird ringed at one site moving to a different one in a subsequent winter. In fact one of the birds recaught at Constantine had been ringed there five years previously, in January 2017! We do also catch birds from elsewhere which again gives us an insight into where these winter birds come from.

The table below shows the total number of Chiffs caught at the sites over the week, including new birds and those already ringed:

ChiffchaffSiberian Chiffchaff
Gwennap STW
Brew STW
Ponsanooth STW
Constantine STW
It's fascinating to see how the proportion of 'tristis' birds varies across the sites, with almost a quarter of birds caught at Brew, down to none at Constantine. This may be due to the surrounding habitat to some degree, as Constantine is very much an inland wooded valley, whereas Brew sits right down near Lands End on a scrubby hill. What's also interesting at Brew STW is that it sits at the top of the Nanjizal valley, where large numbers of Chiffs are ringed on autumn migration. Some of these stay for the winter, so it's interesting to look at when these birds first arrived in the valley. The Nanjizal Chiffs recaught at Brew this week were ringed in February 2020, October 2020, November 2020, and from 2021, on 22nd September (a surprisingly early date), 10th October, 5th and 11th November. As for the 'tristis' Chiffs, they were all ringed much later in the autumn in November 2021, on 18th, 20th and 24th. Some Nanjizal-ringed birds do also move through and winter elsewhere, with birds ringed on 25th October and 11th November recaught at Ponsanooth (44km), and a bird ringed on 6th November recaught at Gwennap (43km).
As for birds from further afield, we saw just one of these, with a Chiff ringed on Hartlepool Headland on 19th October recaught at Gwennap, 565km as the Chiff flies.

We're back to mild, wet weather now so fingers crossed for some more cold settled weather and we can get back to the works and see what we missed this week!

19 January 2022

Eight colour-ringed gull species from eight countries!

We recently received details from BTO of some colour-ringed gulls reported to us over the last cpouple of weeks and it's quite an amazing selection! In total we received details of eight different species from eight different countries:

  • Common Gull from Norway on the Asda roof in Penryn
  • Yellow-legged Gull from Switzerland on Hayle estuary
  • Caspian Gull from Poland at Coverack
  • Mediterranean Gull from Belgium at Swanpool, Falmouth
  • Black-headed Gull from Denmark at Helston boating lake
  • Herring Gull from Wales at Coverack
  • Lesser Black-backed Gull from Portugal on Hayle estuary
  • Great Black-backed Gull from Loee Island in Newlyn harbour

This again goes to show a) how important Cornwall is to wintering birds from right across Europe and b) how important colour-ringing is in showing this.

It also shows that these birds can turn up pretty much anywhere, all seen by local birders with a decent 'scope or camera. So if you're out birding over the winter do keep an eye out for anything out there sporting a shiny colour ring and get reporting.

31 December 2021

Our first Herring Gull to Spain

As 2021 draws to a close, we had an exciting late Christmas present in the form of our first ever Herring Gull sighting from Spain. As we seem to have found, it's our rehabilitated chicks that tend to wander the most and this was no exception, as W:573 was an orphaned chick released at Stithians Reservoir in August 2021 and photographed in NW Spain yesterday.

This is in fact the first Cornish-ringed Herring Gull ever to be found in Spain, with the only other foreign movements reported being to France. The map below shows all of our own foreign movements to date from our colour-ringing, with the location of W:573 marked by the red star, so you can see just how unusual the sighting is!

To put this into some context, the BTO's Online Ringing Report shows only 31 previous records of BTO-ringed Herring Gulls found in Spain, so W:573 really is a special. It'll be interesting to see how long it stays so far south (at the far southern edge of the wintering range for the species) and whether or not it eventually returns to Cornwall.

Many thanks to Nicolás Magdalena García for reporting this bird and allowing us to use his great photos.

18 November 2021

Foreign feel to some resightings

Having just received information back on most of the foreign-ringed birds that we've been seeing locally over the last week or so, we thought it'd be interesting to map them. This gives a really good idea of just where some of our wintering birds come from, of all sorts of species.

The latest batch of reports included:

  • Lesser Black-backed Gull from Portugal
  • Great Black-backed Gulls from Channel Islands and Wales
  • Mediterranean Gulls from Belgium and Netherlands
  • Black-headed Gull from Poland
  • Curlew from Netherlands
  • Cormorant from Ireland

Portuguese Lesser Black-back

Welsh Great Black-back

Dutch Med Gull

Polish Black-headed Gull

14 November 2021

Big gulls from points south

On the back of the Black-headed Gulls from earlier in the week (which all came from points east), this time it's Black-backed Gulls of interest (from points south). Of particular note today were two Great Black-backed Gulls sat close to each other on the island at Gothian Sands, Gwithian.

Yellow 2AA1 is a bird ringed as a chick on Herm, Channel Islands in 2013. It was first seen at Dawlish Warren in March 2014 before becoming a regular in Cornwall from January 2015.

Conversely, L:FZ3 is one of our own, ringed as a chick on Mullion Island earlier in 2021. So far it's the only of of this year's chicks to be seen abroad, seen on a beach in Guernesy on 18th September.

Incredibly though, it was back in Cornwall today, at Gothian Sands sat alongside 2AA1.

The other Black-back from the south was a Lesser seen on Hayle estuary. This is a Portuguese-ringed bird from a rehabilitation project run by RIAS.

13 November 2021

Winter is here and the gulls are coming

 It's always a good sign that winter must be here when we start seeing returning gulls from elsewhere. We know these aren't local birds as many are ringed, so it's just a case of getting out there and reading some rings and colour rings.

Yellow 2PRB was ringed as an adult at Pitsea Landfill, Essex in March 2016
and this is the third winter it's been seen in Cornwall

In just a couple of days this week, we've managed to read several metal rings and also seen some regular colour-ringed birds at Swanpool, Mylor Creek and Stithians Reservoir. The map below shows where some of the British-ringed birds originate from, most of which were ringed as chicks (from as long ago as 2013). We also recorded a bird ringed as an adult in Dorset in 2011, but still have a long way to go to beat the national longevity record of 32 years!

We're also waiting on details of a Belgian-ringed bird which will add another nice dot to the map, along with the regular Danish-ringed bird at Helston Boating Lake. So if you are lucky enough to see a common-or-garden gull wearing a colour ring do get in touch!

Danish-ringed White 8LZ at Helston Boating Lake

17 September 2021

Barn Owl 2021 update

Yesterday afternoon we ringed our last (and latest ever) Barn Owl chicks for 2021, with two present in a box near Carnkie. This was a replacement brood after an earlier failure and only the second time we've ringed chicks in September.

The last Barn Owl chicks of 2021 - a pale male (left) and a darker female

This is then the ideal time to have a look at the numbers and see how 2021 was for our owls. It was an unusual year, with some early broods, some late broods, some regular sites unoccupied, some new sites occupied and generally just lots of surprises.

The totals for the year are below, showing slightly fewer boxes monitored this year, which we can partly blame on lockdown again, so we hope that 2022 will see us back up to checking over 100 boxes. The average clutch size was the lowest we've seen since 2013 which may be a consequence of the spring weather. This also followed through to smaller brood sizes, which were also much lower than in recent years, and fewer chicks ringed than last year.

2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021
Sites visited 32 34 32 44 41 47 64 85 87 106 93
Unoccupied 2 7 12 11 11 12 23 34 36 43 35
Occupied but no breeding 13 2 7 7 7 8 5 4 3 4 5
Average clutch size
(where observed)
4.8 4.1 3.6 4.6 4.6 4.6 5.3 5.2 4.7 4.6 4.5
Average brood size
(where observed)
3.1 3.1 2.4 3.5 3.5 2.8 3.0 3.3 3.0 3.2 2.8
Number of chicks ringed 33 46 20
63 70 47 90 132 119 177 133

We always see a few short movements during the year, with ringed chicks taking up residence in boxes, so below is a map of these noted in 2021.


A few of these are quite interesting though. One site near Zennor was obviously very lucky, with chicks from 2016 (with consecutive ring numbers) both found breeding in other boxes in Penwith in 2021. One had bred at a different site in 2019, but then moved on again in 2021, whilst the other was a new breeder five years after ringing. We also had an adult female switch boxes, having bred at a site for at least two years. she moved a few kilometres down the road to a new site to breed.

One other unusual, and sad, story involved a bird found breeding in a box in June 2020 (with three chicks) that was already ringed. Unusually the ring showed it was of captive origin and had actually come from a breeder in Torquay before ending up at the Screech Owl Sanctuary near Bodmin. It had escaped from there during a flying display and obviously found the wild to its liking, breeding nearby. It then bred again in 2021 but in a different box, but was the sadly found injured six weeks later and was taken back to the sanctuary. The local vet found that it was too injured to be rehabilitated so was sadly put to sleep. It's great to know the full-circle history of this bird, despite the sad ending.

10 September 2021

Returning Osprey

We've previously blogged about a Scottish-ringed Osprey seen at Devoran on its first autumn migration and then again three years later, so read the background here. Remarkably, Blue JF1 has returned again, seen at Restronguet Creek yesterday. We're not sure if it was seen back in Scotland since rigning, but it's great to know that it finds Devoran to its liking and on past performance it will remain on the river for a while yet.

Thanks to John St Ledger for the report and the classic Osprey photo.