Oystercatcher

Irish Name: Roilleach
Scientific name: Haematopus ostralegus
Bird Family: Waders
red
Conservation status

Status

Resident & winter visitor (from Iceland and the Faeroes) - largest numbers in Ireland between September & March

Identification

Large, distinctive wader with long orange-red bill, black head, chest and upperparts and white underparts.

Voice

Noisy - call is shrill, loud 'beep'. Piping call usually from the ground comprises phrases often run together and accelerating 'kip kip kip-kip-kip' and fast 'kli-klikli', and bubbling trill 'prrrr…'. Flight song, usually made in wide-circling display-flight is slower 'plee-ah plee-ah' repeated in time with wingbeats.

Diet

The main food resource includes the larger invertebrates, particularly mussels and cockles that proliferate along sandy coasts. They also occasionally feed on grasslands where they prey on tipulid larvae and earthworms. They feed by both sight (for polychaete worms) and touch (bivalve mussels).

Breeding

Nests principally on shingle beaches, dunes, salt marshes and rocky shores around the coast, but also on some large inland lakes.

Wintering

Use all coastal habitats, and particularly favour open sandy coasts. Around 60,000 Oystercatchers spend the winter around the Irish coast, which is a decline of around 28% since the early 2000's.

Blog posts about this bird

Arctic Tern

A Summer evening on Sandymount Strand

  Over the summer we have been working in Dublin Port on our tern conservation project, funded by the Dublin Port Company. This project focuses on the Common and Arctic tern populations that breed within the Port area. Both Common and Arctic Terns are  Amber- listed species in Ireland - meaning they are of ‘medium conservation concern’ - and the colony that nests within Dublin Port is the third largest in the Republic of Ireland.   Terns have the longest migration of any animal. Arctic Terns, as their name might suggest, have a breeding range that extends up to the Arctic circle during our summer, before migrating down to their feeding grounds in Antarctica during our winter. Though Common Terns don’t migrate as far as this, with Irish- breeding Common Terns migrating down as far as the west coast of Africa during our winter, it is still an impressive distance to travel for a bird that doesn’t weigh much more than 100g.  Part of the work we do to monitor and protect terns in the port involves the ringing of chicks and adults,. This is when we add uniquely coded metal and colour ID rings to individual birds so that we can identify them. This work helps us to assess survival rates, site fidelity (i.e. do individuals return to the same place to breed every year, or do they move elsewhere), as well as to identify migration routes when birds are resighted travelling to and from their breeding grounds.   

(Above: Arctic Tern fitted with metal and colour ID rings, under BTO and NPWS licence) 

Over the summer, most of our ringing work has focused on tern chicks - if you follow us on social media, you may already have seen some of our posts relating to this (and if you haven’t, go ahead and give us a follow to keep updated on our important information, including many cute pictures of birds – links at the bottom of this article). However, as summer draws to an end, and the chicks start to fledge and join the adults to begin their long migration south, we change tactics with the aim of capturing adults rather than chicks.   To do this, we set up mist nests near their evening roost sites. You can see how this looks in the photos below (just!!). It’s a task easier said than done. It requires the right tides to align with the right time and because of this we usually only get one opportunity a year to ring adult and fledgling terns in this way, so it is an exciting opportunity whenever it arises. And luckily, this year did not disappoint!   

(Above 1 & 2, the team setting up the mist nets in the fading light over Dublin Bay) 

We caught not only terns, but also Oystercatchers, Redshanks, Turnstones and even a Black-tailed Godwit! With over 60 birds captured, we caught more birds this year than  in the previous five put together. A fantastic day for us which offers us an opportunity to learn much more about these birds in the years to come. And while that will be the last of the terns we catch this summer as they migrate away, it will hopefully be the first of the waders as they make their way to overwinter in Ireland.   

(Above: a night vision scope used to see when a bird has been caught in the net) 

The highlights of this mammoth haul include; a Common Tern that was ringed in Senegal whilst migrating northwards in the spring, offering us an insight into the migration paths that our Common Terns take; and we had a resighting of a Common Tern that was ringed in 2010., For a species that lives on average to around 10 years old, a resighting of a 15-year-old is pretty special; we colour- ringed three Turnstones, which is part of a new project on this species and so we are delighted to be able to ring these for the first time; and we also had a resighting of an Oystercatcher, which helps build our knowledge on the site fidelity of this species and their migration routes between their summer breeding and winter feeding grounds.  All in all, it was a great night s outing for us and we will be keeping everything crossed for the same again next year! Until then, follow us on Facebook, Instagram and X for updates on all of our ongoing work.   If you would like to support us and to make a direct contribution to the protection of Ireland’s birds and biodiversity, please do so by becoming a member here and signing up for our members only newsletter, Wings, alongside many more members only benefits.   

(Above: Redshank fitted with metal and colour ID rings) 

All photos taken under NPWS license and all handling and ringing is done by trained and licensed bird ringers.   The Dublin Bay Birds Project is funded by 
I-WeBS

BirdWatch Ireland welcomes An Bord Pleanála decision on Boyne Greenway proposal

BirdWatch Ireland welcomes An Bord Pleanála’s decision to uphold the need to protect sites for threatened bird species by refusing to grant permission for a proposed new section of the Boyne Greenway. The proposal for the construction of a pedestrian walkway and cycleway from Drogheda town to Mornington Village in County Meath was refused by An Bord Pleanála (ABP) at the end of August. In its report, ABP stated that it was not satisfied that the local authority has demonstrated beyond reasonable scientific doubt that the proposed development would not adversely affect the integrity of three protected sites – Boyne Coast and Estuary Special Area of Conservation (SAC), River Boyne and River Blackwater SAC and the Boyne Estuary Special Protection Area (SPA). It noted that an absence of detailed information about a 2.4 km boardwalk proposed to be built inside the protected areas meant that avoiding adverse effects on these sites could not be guaranteed should the development go ahead. ABP also stated that it was not satisfied that important sand dune habitats would not be damaged by the greenway, nor that post-consent monitoring aimed at mitigating damage could be relied upon. The impact of increased human activity along the Boyne Estuary and the risk of adverse impact that this could have on wintering waterbirds of the Boyne Estuary SPA was also noted, with ABP adding that it was not satisfied that proposed mitigation measures would be effective in preventing disturbance of these species. This refusal and the reasons behind it are in line with concerns that have been raised by us since the project was initially put forward. We made our first submission to An Bord Pleanala regarding the greenway during the initial public consultation process in September 2020. While, as an environmental organisation, we welcome initiatives that reduce car usage and subsequently, greenhouse gas emissions, we objected to this development due to the significant threat to the bird life in the Boyne Estuary SPA. With 2.4 km of the greenway proposed for construction within the boundary of the Boyne Estuary SAC and SPA and adjacent to the River Boyne and River Blackwater SAC, we had strong concerns about the threat of human disturbance and potential displacement this could cause to waterbirds in this area. From information provided by the developers, BirdWatch Ireland estimated that 210,000 new walkers including with dogs and cyclists would be using the boardwalk within the habitats for migratory waterbirds during the winter period when the birds are refuelling and resting before returning to Greenland, Iceland and the high Arctic to breed. Migratory birds need access to safe roosting and feeding sites in order to rest and feed while overwintering in Ireland. However, disturbance from pedestrians, cyclists and dogs can cause birds to leave or completely avoid certain sites, leading to increased daily energy expenditure coupled with insufficient rest and fuel levels. This negatively impacts the ‘fitness’ of these birds (defined as the ability of an individual to survive, and breed and produce viable offspring, hence securing future generations of the species), so therefore can lead to population declines. As the frequency and duration of human activity on the proposed greenway would be high, there is no doubt that it would lead to disturbance to the bird life in the SPA. BirdWatch Ireland made an additional submission in May 2022 following a request by ABP for further information from Meath County Council. On reviewing the additional information provided, we concluded that those proposing the project had not proved that disturbance caused by the greenway could be mitigated by their suggestions of screening and signage along the boardwalk. Our submission was underpinned by Irish Wetland Bird Survey (I-WeBS) data showing both national and site-specific declines in the waterbird species listed for the Boyne Estuary SPA. Of the ten wintering waterbirds of special conservation interest listed for the Boyne Estuary SPA, half have a declining site status based on the long-term 23-year trend – Oystercatcher, Golden Plover, Grey Plover, Lapwing and Turnstone. The fact that these species are in decline at sites that are designated to provide a safe space for them underscores its unsuitability for a greenway. It further highlights the failures of the relevant authorities to manage existing activities that are causing deterioration of habitats and disturbance to waterbirds. The sand dune habitats, in particular, have undergone a great amount of damage due to a lack of management. The overarching Conservation Objective for Boyne Estuary SPA “is to ensure that waterbird populations and their wetland habitats are maintained at, or restored to, favourable conservation condition”. We welcome the fact that, in this instance, this objective and threats posed by development to already vulnerable waterbirds have been acknowledged. However, looking forward, we believe there is a clear need for strategic guidance on greenway proposals, guidance which gives equal footing to biodiversity, climate and the needs of local residents. Not only would this approach prevent environmental damage, it would also reduce the amount of time and public money spent deliberating such proposals. BirdWatch Ireland fully supports the development of greenways and initiatives that promote a modal shift in transport. These have obvious important benefits to climate but also economic and well-being benefits. However, it is vital that such developments do not come at a cost to our biodiversity, which is already experiencing pressures from all sides. In May 2019, Dáil Éireann declared a climate and a biodiversity emergency. Both must be addressed together.