Grasshopper Warbler Locustella naevia   [Boddaert, 1783]

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Order: Passeriformes Family: Sylviidae
BTO Codes: GH, GRAWA EURING No: 12360
Number in Britain: 13 thousand Territories (Summer)
Conservation Status:
UK: RED
European: Not a species of concern
Global: (Details)
Status in UK: (A)  Migrant Breeder, Passage Visitor
Subspecies: naevia recorded in Britain (of 4 subsp. in the world)
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Length: 13 cm Wingspan: 17 cm Weight: M/F: 14 g    
Scientific name from: L.: Locustella=little grasshopper and L.: naevius=spotted
World Distribution: BREEDS: Eurasia, WINTERS: n Africa to India
Habitat: Marsh, moor, open woodland
Diet: mainly insects, hunts restlessly through vegetation
TitBit: The distinctive sound of this bird has been variously likened, the sound made by insects, mill wheels, spinning wheels and fishing reels, reflecting technological progress more than a change in the bird's song.  
Identification Tips:
  Images from IBC or search flickr
  Videos from IBC
  Sound from xeno-canto
Crossley ID photos

Population and Distribution

Population Trend: BirdTrends   
Regional Trends: England   English Regions
Distribution: Atlas Mapstore   
British Population Size:
    Summer: 13 thousand Territories in 2009
    First Record: 1678
    Latest Survey: Musgrove, A. et al. (2013) British Birds 106:64-100
    Conservation Status: RED because Recent Breeding Population Decline,
   Previous Assessments: 2002-2007 RED     1996-2001 AMBER  
   Races of Concern: naevia RED (Recent Decline)
Habitat Occupancy (in the Breeding Season):
    Most frequent in: Reedbed
Relative Frequency in Each Habitat:
Average Day of First Arrival: 13 Apr
European Population Size:
    Summer: 340 to 700 thousand pairs   (Trend in Numbers)
Population Assesment from Birds in Europe
Distribution in Europe mapped by the EBCC Atlas
Listed on the Appendices/Schedules of: Bern(III), Bonn(II), NERC (41)
Survey Results: Results from BirdTrack

Breeding and Survival

Egg Size: 18 x 14 mm Egg Weight: 1.7 g (of which 6 % is shell)
Number of Nest Records: 6
Clutch Size: 5 - 6 eggs 5.55 ± 0.85 (3 - 7) N = 119
Incubation: 14 days 14.07 ± 0.59 (13 - 15.5) N = 119   by the: Male + Female
Fledging: 12 - 13days 11.77 ± 0.93 (10 - 13) N = 183 as: Altricial, downy
Source:
British Trust for Ornithology (2005) Nest Record Scheme data
First Clutches Laid: 21 May (6 May - 7 Jul)
Number of Broods: 2
See trends in Breeding Productivity
Number Ringed: Annual Totals
Adult Survival: No data
Juvenile Survival: No data
Age at First Breeding: 1 year Typical Lifespan: No data
Maximum Recorded Age: 5 years 0 months 16 days (set in 1986)
Read a summary of Ringing Recoveries

Biometrics

Ring Size: A
Wing Length Adult: 63.8 ± 1.7 Range 61 - 67 mm, N =790
Juvenile: 64.2 ± 1.6 62 - 67 mm, N =2655
Male: 64.6 ± 1.6 62 - 67 mm, N =221
Female: 63.3 ± 1.6 61 - 66 mm, N =95
Weight Adult: 13.26 ± 1.13 Range 11.50 - 15.20 g , N =725
Juvenile: 13.08 ± 1.09 11.50 - 15.00 g , N =2601
Male: 13.05 ± 0.93 11.70 - 14.70 g , N =193
Female: 13.56 ± 1.46 11.50 - 16.20 g , N =85
Source:
British Trust for Ornithology (2005) Ringing Scheme data

Other Names

Common Grasshopper Warbler
Gaelic: Ceileiriche-leumnach Welsh: Troellwr Bach
Danish: Græshoppesanger Dutch: Sprinkhaanzanger
Finnish: Pensassirkkalintu French: Locustelle tachetée
German: Feldschwirl Hungarian: Réti tücsökmadár
Icelandic: Engisöngvari Irish: Ceolaire Casarnaí
Italian: Forapaglie macchiettato Norwegian: Gresshoppesanger
Polish: Swierszczak zwyczajny Portuguese: Felosa-malhada
Spanish: Buscarla pintoja Swedish: Gräshoppsångare
Local Names: Reeler

For More Information...

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