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Locustella fluviatilis, River Warbler

Passeriformes – Locustellidae

Filters: (select multiple values)

Sex

F M U

Age

1CY (euring: 3) 1CY+ (euring: 4) 2CY+ (euring: 6)

Sex determination

in the field

Month

May June July August

Year

2018 2019 2020 2021 2022 2024

Repeatedly photographed

Locality

Jeseníky Mts., Czech Republic Vysočina Region, Czech Republic

Moulting

not in moult body remiges

Other remark

no remark ageing remark unusual moult

Reset filters 17 individuals shown

CZEP18-280

Sex: M, age: 1CY+ (euring: 4). Trapped: May, 2018 in Vysočina Region, Czech Republic.

CZEP18-365

Sex: M, age: 2CY+ (euring: 6). Trapped: May, 2018 in Vysočina Region, Czech Republic.

Age is known more precisely as this is a retrap. This bird was ringed as 1CY+ (euring 4) in June, 2017.

CZEP18-394

Sex: M, age: 1CY+ (euring: 4). Trapped: June, 2018 in Vysočina Region, Czech Republic.

CZEP18-438

Sex: M, age: 1CY+ (euring: 4). Trapped: June, 2018 in Vysočina Region, Czech Republic.

CZEP18-500

Sex: M, age: 1CY+ (euring: 4). Trapped: July, 2018 in Vysočina Region, Czech Republic.

CZEP18-679

Sex: U, age: 1CY (euring: 3). Trapped: August, 2018 in Vysočina Region, Czech Republic.

CZEP18-687

Sex: U, age: 1CY (euring: 3). Trapped: August, 2018 in Vysočina Region, Czech Republic.

CZEP19-181

Sex: M, age: 1CY+ (euring: 4). Trapped: May, 2019 in Vysočina Region, Czech Republic.

CZEP20-248

Sex: M, age: 1CY+ (euring: 4). Trapped: June, 2020 in Vysočina Region, Czech Republic.

CZEP20-291

Sex: U, age: 1CY+ (euring: 4). Trapped: July, 2020 in Vysočina Region, Czech Republic.

Moult: remiges

Very interesting bird as it shows some moult of remiges before autumn migration – not only some retrices but also secondary 3 and 4. That is very rare in River Warblers to moult on breeding grounds. Moult of remiges alone is not enough to age this bird as 1CY+ (euring: 4) as both adult and young birds do not moult secondaries in the post-breeding moult. On top of that, iris colour looks more like a 1CY (euring: 3) bird. I am ageing it as 1Y+ because of the structure of primary coverts and alula feathers. I might be wrong, though.