Annual Chough report 2024

Background 

Red-billed choughs are considered a rare species in the UK, Ireland, Isle of Man and north west France and, until recently, were classified as locally extinct in the Channel Islands. Changes in agricultural practices decimated their habitat and primary food source, resulting in their rarity. Several other bird species have suffered a similar fate. 

Birds On The Edge is a conservation initiative to restore coastal farmland habitat in order to benefit these species. The chough (caûvette in Jerriais) is the flagship for this work and in 2010 Durrell began a captive-breeding programme with the intention of releasing offspring into the wild. 

Intensively managed releases between 2013 and 2018, coupled with post-release monitoring and care have resulted in a highly successful reintroduction. The Channel Islands is home once again to a breeding population of choughs. 

Danny & Pyrrho’s family portrait. Photograph by Charlotte Dean.

 

Notable Events and Successes in 2024 

The majority of our breeding success has been centred around our pairs nesting in Ronez Quarry. Interestingly, there were successful pairs from other areas around Jersey too and we hope to investigate these nest sites next year. A total of nine nests were checked at Ronez, six of which were active and successful. After the initial chick ringing visit, Ronez staff found another nest at the quarry which we’ll have to look out for in the next breeding season.

Kevin & Wally’s three chicks on first quarry nest checks. Photograph by Charlotte Dean.

When visiting the nests at Ronez, fourteen chicks were found. Pairs that were nesting in the quarry were: Lee & Cauvette, Bo & Flieur, Trevor & Noirmont, Percy & Icho, Dusty & Archirondel and Kevin & Wally. On our checks at the quarry we presumed Red & Dingle had made a nest together. But unfortunately no chicks were found in their nest. Lee & Cauvette, Bo & Flieur, Kevin & Wally all had three chicks in their nest. Trevor & Noirmont and Percy & Icho both had two chicks in their nest. Dusty & Archirondel had a nest they were visiting, but on a second visit, it looked to be unsuccessful. We believe there were two other active nests at Ronez, however, neither of which was accessible; and with so many new pairings, it could have been anyone’s!

Table 1, chough breeding success at Ronez quarry.

Breeding Pair

Nest location 

Number of chicks in nest 

Number of chicks fledged 

Red & Dingle

Ronez

0

0

Lee &Cauvette

Ronez

3

3

Bo & Flieur

Ronez

3

2

Trevor &Noirmont

Ronez

2

2

Percy &Icho

Ronez

2

2

Dusty &Archirondel

Ronez

1

0

Kevin & Wally

Ronez

3

2

 

Totals

14

11


There were several nests that were never visually confirmed and some were from first time breeders; these pairs included: Danny & Pyrrho, Jaune & Aspen and Alder & Wally Jnr. Danny & Jaune had been a pair since 2021 however, had not been deemed successful. As we’ve lost a few older males and females in the flock, the pair split and re-paired with new partners. This seems to have worked in their favour as both new pairs: Danny & Pyrrho and Aspen & Jaune, brought two chicks to the aviary.

A completely new pair that bred for the first time this year was Alder & Wally Jnr. They brought one chick to the aviary; which is a huge success for the pair. We’re hoping that these pairs will continue to have successful breeding seasons going forward.

Another pair, Vicq & Pinel, that used to build their nest in a local stable in Trinity have successfully bred again.  Although the exact location of their nest is unknown, we do have our suspicions as to where it might be. Last year they brought their very first chick to the aviary and this year we were over the moon to see them arrive at Sorel with two chicks in tow.  We hope that this pair will continue to have successful breeding seasons in the future.

Minty & Rey with their five chicks. Photograph by Charlotte Dean.

Our Plemont pair; Minty & Rey, started the breeding season very early, they were a good few weeks ahead of the rest of the choughs that were breeding. The first signs of chicks in the nest brought us great joy; there were five hungry beaks waiting for their lunch. It seemed the pair had a feeding schedule, where one would chase off ravens and/or crows; while the other would feed the chicks. It seemed quite energetically consuming, however it was working in their favour; as their chicks grew up very quickly. We waited patiently for them to arrive at the aviary and sure enough, two of the five chicks managed to make it to Sorel. Although they lost a few chicks (which is inevitable in the wild) they still had a pretty successful year.

Table 2, chough breeding success in other locations across the island.

Breeding Pair

Nest location 

Number of chicks in nest 

Number of chicks fledged 

Danny &Pyrrho

Ronez

2

2

Aspen & Jaune

Unknown

2

2

Alder & Wally Jnr

Unknown

1

1

Pinel & Vicq

Unknown

2

2

Minty & Rey

Plemont

5

2

 

Total

12

9


Over the course of 2024 we’ve had a total loss of nine birds. Six of which were chicks and three of which were long-standing breeding adults. However, an overall of 26 chicks were hatched in the breeding season, the most chicks produced since the project began! 20 of those 26 chicks managed to fledge from their nests, bringing the total population to a whopping 63 birds! The team hope that next year will be just as fruitful.

Table 3, indicating the current population size as well as the flock’s sex ratio. 

Population size 

Males 

Females 

Unknown 

63

22

35

6


In 2024, there were twelve breeding pairs, ten of which fledged chicks. A total of 26 chicks were hatched, the most since the project began!

Activities in 2024

Primary activities continued as detailed below:

Supplemental feeding 

Provision of supplemental food continues daily at Sorel. Attendance by the flock varies seasonally and between individuals. It remains a reliable way to ascertain population size. There are currently sixty-three individuals of which over two thirds are now wild-hatched (Released: 11: wild hatched: 52). Due to the steep increase in population size, the supplementary feed has been adjusted.

Supplemental feeding allows staff to closely monitor health issues and inter-flock behaviour. Concerns can be flagged up quickly and often dealt with on the spot.  

A pair eating from a feeder in the Sorel aviary. Photograph by Charlotte Dean.


Notable leavers and losses  

The last and only chough left from the first batch of releases, ‘Red’, at the age of twelve, has sadly disappeared during the breeding season. Her partner Dingle was seen arriving alone, leading us to assume that Red was incubating in a nest. Dingle was then seen with another female named Iris. This is not unheard of in males, and they can sometimes be seen hanging out with other females while their partner is incubating. As Red has not been seen since May, she is believed to have died.

After the breeding season had ended and the chicks were no longer hanging off their parent’s beaks, Cauvette disappeared. We noticed her disappearance from her partner, Lee, arriving to the aviary alone. Since Cauvette’s disappearance, Lee has gained a lot of female attention. He’s now often seen flying to the aviary along with two other females (Elm and Willow). It will be interesting to see if Lee pairs up with either of these females next breeding season, but for now, we think he’s enjoying being a lady’s man!

Cheddar, a male juvenile from Minty & Rey’s nest this year has also disappeared leaving the last male chick from their nest, Sakura as the sole survivor.

Red & Dingle on a feeding station. Photograph by Charlotte Dean.

Research and monitoring 

There has been no sign of island hopping, it seems that females Portelet and Archirondel, who had been taking weekend trips to Guernsey have found a reason to stay on island. Both females have managed to pair up with other males in the flock. Portelet has paired with Sallow, a male hatched in 2022. Archirondel has paired up with Dusty; the very first wild hatched chough for the project in 2015. As the sex ratio of the flock is evening out, it will be interesting to see if any other choughs in the flock will decide to island hop in the future.

The team have been notified of various nesting sites from Jersey residents via the Birds of the Edge website this year. Many of these sites have been investigated and will be monitored once the breeding season heats up next year. The team appreciate the time and effort bird enthusiasts around the island dedicate to this project to enable us to gain the most information we can on the chough population.

Public sightings – where have you seen the choughs this year?

The choughs have been seen all across Jersey by you, the Jersey residents. This year we received 263 public sightings! But we ask for you to keep them coming in! Sightings can be sent to us via the birds on the edge website on the ‘Seen a chough’ page or sent to us directly by email: charlotte.dean@durrell.org.

The places that choughs were seen in the largest flocks were: Sorel with 30, Corbiere with 16, Les Landes and St Ouen with 15, Noirmont and St Brelades with 14. The hotspots where the most sightings were recorded were: Corbiere, St Ouen, Noirmont, Les Landes and Plemont. However, the choughs were also seen in various other places around the island. It’s great to see how much the choughs are dispersing across the island. Let’s see if we can beat 263 sightings next year; keep looking, keep reporting and keep enjoying the red-billed choughs flying around your neighbourhood.

Veterinary cases 

One of the choughs, Kevin had been seen with a black toe on his right foot which was in turn causing lameness. They were caught, weighed and examined by the Durrell veterinary team at the aviary. The chough seemed to have had trauma to the toe which had bled and dried on the toe making the toe look black in colour. It was however, still swollen. The chough was given a shot of pain relief and anti-inflammatory as well as having the toe thoroughly cleaned. They were then re-released and have been healthy ever since.   

Kevin’s injured digit. Photograph by Charlotte Dean.

Minty & Rey, the pair that nest in Plemont almost exclusively were very successful this year. They managed to hatch five choughlets! Unfortunately, on one of the nest monitoring trips, one chick was found directly beneath their nest and headless. The Durrell veterinary team carried out a post-mortem to determine cause of death – due to its injuries it was suspected to of died from impact (fell from the nest) and then scavenged.  

Percy. Photograph by Charlotte Dean.

Lee, one of our continually breeding males was looking under the weather during the breeding season. They were witnessed falling asleep on a feeding stand in the aviary. A faecal sample was retrieved and examine by our veterinary team. It showed some signs of parasites. Choughs generally carry low levels of parasites but can heightened in stressful situations (e.g. breeding season) or in ill health. As this bird had chicks to feed the team didn’t want to intervene unless absolutely necessary; thankfully he seemed to of perked up the next day.

Missing claw on Rougenez. Photograph by Charlotte Dean.

Rougenez, a chough that was hatched in 2022 was caught and re-ringed this year due to losing vital colour rings (We couldn’t identify them without their individual colour combination). Once caught and weighed we noticed that they had a claw missing on their left foot. It had completely healed over and doesn’t seem to affect the way it exists.

Our bi-annual pooled faecal samples were taken over a couple of days. This involves collecting a great deal of fresh faeces from anywhere it’s seen at the aviary and submitting it to our laboratory to be examined for parasite loads. There were very low amounts of coccidian found within the faecal samples which showed that the population as healthy as it can be. Low levels of coccidian in choughs are relatively normal however can elevate when they bird becomes sick or stressed.

 

Release aviary maintenance 

The site services team have been hard at work during the autumn and winter period refreshing the Sorel aviary. The new netting was purchased, fitted and replaced. This could only be carried out thanks to the generosity from the Jersey Country Enhancement scheme. The wooden framework and release hatches have been stripped down, section by section, reconstructed and erected. The last of the heavy work left in the aviary is replacing the shelves.

First looks at the aviary after storm Darragh. Photograph by Charlotte Dean.

Jersey was hit by another storm; Storm Darragh. It wasn’t as powerful as Storm Ciaran but unfortunately it still did a great deal of damage to the aviary. A section of the roof was bent out of shape, the aluminium panelling had collapsed in several places, a few holes had emerged on the new netting and the guttering had been found across the field. Luckily we have a great site services team which can help with any significant repairing tasks.

Disconnection of poly tunnel structure. Photograph by Charlotte Dean.

 

Choughs on the newly refurbished aviary. Photograph by Charlotte Dean.

Chough report – Forth quarter (October – December)

The results are in
This year’s breeding season was a huge success. The pairs fledged more chicks than in any year previously. We sent off biological samples to find out what the sex ratio of chicks is this year, and we couldn’t be happier with the results. This year’s chicks have given a sex ratio of 9:11 (Males: females). To see the sexes of each individual, check out our updated chough ID list on our ‘Seen a chough’ page. The overall sex ratio of the flock is now: 22: 35: 6 (Males : Females : Unknowns). The flock’s sex ratio is starting to even out, allowing more breeding pairs to arise in the future – which is great news! Although the newly fledged chicks will unlikely be ready to reproduce next year; there is always time to surprise us!

Angalsea & Islay foraging. Photograph by Mick Dryden.

Supplementary feed adjustments
The chough population has grown from 32 in 2021 to 63 in 2024. The supplementary feed given has therefore been increased to account for such continued growth in population. The supplementary feed is provided in containers with specific dimensions for the species. Choughs have long bills which they use to probe soil for invertebrates; therefore the feeding boxes are at a depth for them to perform normal foraging behaviours to gain food. The depth of these feeding boxes also reduces inter-species interactions in the aviary. Continuing to provide a supplementary feed allows us to monitor the population at an individual level. Although, not all choughs are seen as regularly as others; this indicates that they must be finding adequate food sources from the island.

Two choughs using the feeding boxes at the aviary. Photograph by Charlotte Dean.

Chough adventures
A chough was found in the basement of the Atlantic hotel, Corbiere in October. The chough was identified as Neufchatel, a young female bird which hatched earlier this year. The basement of the Atlantic hotel is a floor and a half below ground level and access into the building is by a long staircase from outside. The chough was found by an employee at the hotel and was successfully released from the basement. They have been seen happy and healthy at the aviary ever since.

Neufchatel and several other juveniles foraging. Photograph by Charlotte Dean.

Chough movements
During October, the largest numbers seen in a flock together were 14 at Noirmont and St Brelades Bay. Choughs were seen in flock sizes of five at Les Landes and with a pair seen in L’Etacq. Pairs were being regularly seen along the south-westerly coast including Corbiere, Petit port, Noirmont, Beauport and various locations within St Ouens. Choughs are also being seen on the south-eastly corners of Grouville golf course. A pair were also spotted in St Helier.

Throughout November, the choughs were seen in various places across the island. A flock of 18 were spotted at Les Mielles golf course. The most frequently occurring numbers were seen in St Ouen with a flock of 15 seen at the sand pits. However, they were also seen in smaller numbers at Corbiere, Les Landes, St Peters and St Helier.

There were fewer overall sightings received for the choughs during December. The largest flock seen was nine over the pond in St Ouen and five at La Moye golf course. Other sightings were of pairs or singular individuals around St Ouens, twice in Crabbe in three separate places within St John.

Choughs watching us in the field. Photograph by Charlotte Dean.

Aviary refurbishments and Storm Darragh’s disasters
The aviary was having its last and final repairs carried out over the winter period. The last of the wooden framework was erected, and most of the shelving had been replaced. The sites service team was close to finishing the repairs, however, another storm hit Jersey. It was not as strong as storm Ciaran but it still caused some significant damage. Due to strong winds, the aviary was unserviceable over the course of Storm Darragh (the weekend) as the government advised for only essential travel. As the aviary is next to the coast, it was unwise for us to visit the site. All preparations had been carried out prior to the storm to ensure that the aviary was open and safe for the choughs. When Monday came, the team had the job of assessing all the damage: a part of the roof had been torn off and bent out of shape, the aluminum paneling had collapsed in several places, a few holes emerged in the aviaries new netting, the guttering had disconnected and a few days later the supporting poles disconnected. It’s safe to say, we’ve got a lot of repairs on our hands!

The damage caused by storm Darragh. Photographs by Charlotte Dean.

Some Festive enrichment over the holidays
It’s that time of year again when we must remember to share the Christmas joy with everyone, including our red-billed choughs. The team ensured the choughs could send their Christmas letters to Santa this year. Merry Christmas everyone and have a great start to the new year!

Choughs lining up to send their letters to Santa. Photograph by Charlotte Dean.