Blue Tit Cyanistes caeruleus   [Linnaeus, 1758]

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Order: Passeriformes Family: Paridae
BTO Codes: BT, BLUTI EURING No: 14620
Number in Britain: 3.4 million Territories (Summer)
Conservation Status:
UK: GREEN
European: Not a species of concern
Global: (Details)
Status in UK: (A)  Resident Breeder, Winter Visitor
Subspecies: obscurus (R), caeruleus (W) recorded in Britain (of 15 subsp. in the world)
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Length: 12 cm Wingspan: 18 cm Weight: M/F: 11 g    
Scientific name from: L.: cyaneus=dark-blue (from Gr.:kuanos) and L.: caeruleus=blue
World Distribution: Europe, Near East, nw Africa
Habitat: Woodland, scrub, towns
Diet: Insect and spiders, also fruit and seeds in winter
TitBit: Like all birds, Blue Tits can see ultra-violet light - the front of their heads glows brightly under UV light; this is how females are thought to choose their partners.  
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: Scotland   Wales   England   English Regions
Distribution: Atlas Mapstore    BBS Maps
British Population Size:
    Summer: 3.4 million Territories in 2009
    First Record: Recorded in Anglo-Saxon times
    Latest Survey: Musgrove, A. et al. (2013) British Birds 106:64-100
    Conservation Status: GREEN
   Previous Assessments: 2002-2007 GREEN     1996-2001 GREEN  
   Races of Concern: obscurus AMBER (Important Population), caeruleus GREEN
Habitat Occupancy (in the Breeding Season):
    Most frequent in: Deciduous Wood
    Also common in: Pasture Farmland, Villages, Towns
    And found in: Scrub, Arable Farmland
Relative Frequency in Each Habitat:
European Population Size:
    Summer: 19 to 42 million pairs
Population Assesment from Birds in Europe
Distribution in Europe mapped by the EBCC Atlas
Listed on the Appendices/Schedules of: Bern(III)
Survey Results: Results from BirdTrack
Results from Garden BirdWatch

Breeding and Survival

Egg Size: 16 x 12 mm Egg Weight: 1.1 g (of which 6 % is shell)
Number of Nest Records: 4000
Clutch Size: 8 - 10 eggs 9.06 ± 2.14 (2 - 16) N = 2875
Incubation: 13- 15 days 13.88 ± 1.31 (12 - 16) N = 2875   by the: Female
Fledging: 18 - 21days 19.28 ± 2.16 (15 - 22.5) N = 4391 as: Altricial, downy
Source:
British Trust for Ornithology (2005) Nest Record Scheme data
First Clutches Laid: 26 Apr (12 Apr - 11 May)
Number of Broods: 1(2)
See trends in Breeding Productivity
Number Ringed: Annual Totals
Adult Survival: 0.532 ± 0.008    (M:0.508 ± 0.034; F:0.421 ± 0.028)      
Juvenile Survival: 0.379 (in First-Year)  
Age at First Breeding: 1 year Typical Lifespan: 3 years
Maximum Recorded Age: 9 years 9 months 2 days (set in 1990)
Read a summary of Ringing Recoveries

Biometrics

Ring Size: A
Wing Length Adult: 63.3 ± 2.8 Range 60 - 67 mm, N =102856
Juvenile: 62.9 ± 1.9 60 - 66 mm, N =86391
Male: 65.3 ± 1.5 63 - 68 mm, N =23092
Female: 61.9 ± 1.4 60 - 64 mm, N =29571
Weight Adult: 10.88 ± 0.78 Range 9.70 - 12.20 g , N =77569
Juvenile: 10.80 ± 0.96 9.60 - 12.00 g , N =64622
Male: 11.20 ± 0.73 10.10 - 12.40 g , N =16854
Female: 10.64 ± 0.78 9.50 - 12.00 g , N =21702
Source:
British Trust for Ornithology (2005) Ringing Scheme data

Other Names

Previously Parus caeruleus 
Gaelic: Cailleachag-ghorm Welsh: Titw Tomos Las
Danish: Blĺmejse Dutch: Pimpelmees
Finnish: Sinitiainen French: Mésange bleue
German: Blaumeise Hungarian: Kék cinege
Icelandic: Blámeisa Irish: Meantán Gorm
Italian: Cinciarella Norwegian: Blĺmeis
Polish: Modraszka Portuguese: Chapim-azul
Spanish: Herrerillo común Swedish: Blĺmes
Local Names: Tom Tit

For More Information...

Books and Monographs:
   Perrins, C. 1979 British tits Collins, London [598.922 PER]
   Flegg, J. 1987 The Blue Tit Shire Publications, Princes Risborough [Jour: S]
See Also:
Find scientific papers on Google Scholar or Scirus by clicking the icon
Wikipedia entry
HBW account (subscription required)
BirdLife species page
Recent sightings and information from BirdGuides