Report of the month - July


History: The nature reserve "Schlammwiss" was founded in 1982 by the foundation"Hellef fir Natur" (HFN). Afterwards the group "Letzeburger Natur- a Vullenschutzliga" (LNVL) founded the station "Schlammwiss". The station is leaded by the "centrale ornithologique Luxembourg" (COL), a part of the asbl. Natur & Emwelt. Due to the fact that Luxembourg doesn't have its own bird ringing central, we work in cooperation with Royal Belgian Instutitute of Natural Sciences. Therefore, we use rings from the Belgian Museum of Natural Sciences.


Location: The bird ringing station "Schlammwiss" is located in Luxembourg, between the communities Schuttrange & Munsbach. The nature reserve is part of the 375ha big Syrvalley and is an extremely important Natura 2000 zone. The reserve is periodicly flooded due to the Syr river, which is an important generator of biodiversity.


Research area: Around 30ha are used for researche, on a length of 1km and a width of 30-120m. The main area is covered by reeds and wetlands (20ha). Furthermore, the resarch area is subdivided and caracterized by an orchard, a forest, several ponds distributed throughout the reedbed and a purification plant (SIAS). The main techniques employed are mist nets and rail traps in order to realize population estimates (i.e. breeding population, migration, overwintering population) and survival estimates by Capture-Mark-Recapture. There are several projects running in the nature reserve and visitation are possible.


Summary of the ringing activity this month

In July, the bird ringing station "Schlammwiss" caught about  2773 birds of 51 species. This number is subdivided in 1828 E, 891 W and 54 K. 4 bird foreign origin has been caught.


The total amount of birds for the month July is higher (+675) than the average amount of birds caught at the station from 2001-2018 and higher (+1580) than the number of last year. The graphic below shows the average amount of birds for each month during the years 2001-2018 in comparison of the numbers of this years, 2018 and the working time for this and last year at the station Schlammwiss.



E:  first capture of this individual

W:  recapture of an individual which was already captured this year

K:  individuals which were ringed one or more years ago or individuals with a foreign country or station


Top 5

1. ACRSCI Reed Warbler 330
2. ARCPAL Marsh Warbler


3. SYLATR Blackcap 212
4. PARMAJ Great Tit 187
5. PARCAE Blue Tit 163

Interesting birds captured:

  • 3 Actitis hypoleucos
  • 2 Charadrius dubius
  • 1 Delichon urbicum
  • 3 Falco tinnunculus
  • 2 Garrulus glandarius
  • 2 Hippolais polyglotta
  • 1 Parus montanus
  • 1 Phoenicurus ochruros
  • 5 Phoenicurus phoenicurus
  • 6 Sylvia curruca


Distribution of the age:

Code Amount Definiton
C 5 older than four years
B 4 born four years ago
A 5 older than three years
9 4 born three years ago
8 5 older than two years
7 3 born two years ago
6 9 older than one year


born last year


age unkown, but not born this year
3 2097 born this year
2 20 age unknown
1 5 nestling

Distribution of nestlings - Code 1

Species Name Quantity    
    May June July
Coloeus monedula  Western Jackdaw 1    
Parus caeruleus Blue Tit 10    
Parus major Great Tit 139 39  
Passer domesticus House Sparrow 2    
Passer montanus Tree Sparrow 4    
Sitta europea Eurasian Nuthatch 8    
Athene noctua Little Owl  


Falco tinnunculus Common Kestrel   12 3
Passer montanus Eurasian Tree Sparrow   5  
Tyto alba Western Barn Owl   6  
Charadrius dubius Little Ringed Plover     2
Σ   167 70 5

Foreign birds that we controlled this year:

Month Species Country
January Cyanistes caeruleus France
February Parus major Belgium
March Turdus merula Belgium
  Troglodytes troglodytes Belgium
  Erithacus rubecula Sweden
April Parus major Belgium
  Sylvia atricapilla Belgium
  Sylvia atricapilla Spain
May Acrocephalus scirpaceus Spain
  Acrocephalus scirpaceus Belgium
  Acrocephalus scirpaceus Belgium
  Acrocephalus scirpaceus Belgium
  Acrocephalus scirpaceus Belgium
June Acrocephalus scirpaceus Belgium
July Acrocephalus palustris Belgium
  Acrocephalus palustris Belgium
  Parus major Belgium
  Parus major Belgium


The team of the bird ringing station Schlammwiss are mostly volunteers who did an excellent work this month!


 We say thank you for everyone who was helping this month!






In summary we spent around 145 hours during 25 days working at the station.



 We also welcome the visitors on our station:



All our sightings of this month are saved in


Compute total number of birds

Compute total number of observation

The weather information are offered by


Thank you!

Photos of this month

Some photographers sent us their photos which we included into our report.

All other photos are provided by Jim Schmitz.


Thank you for the photos!





Did you take any photos at the station, a visit or of any birds with a ring that could be from our station and want to publish those in the next report of the month?

Contact us!

Extra story:



Thanks to the editiors of this report:

Charel Klein

Photos: Jim Schmitz, Kelly Kieffer

Providing the data: Cédric Brodin:

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