How does the blue tit see?
The blue tit (Cyanistes caeruleus) is a bird in the order Passeriformes. Its eyes belong to the vision type UV songbird, parrot and hummingbird: 4 cones with a true UV (UVS) cone and oil droplets, high CFF; UV plumage patterns visible.
Measured in this species: colour, night vision and motion (flicker fusion). Measured core: measured values on at least 3 of the 6 dials. Every value below carries its evidence level and sources; nothing is typed by hand.
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What stands out
- It has 4 colour receptor classes, including ultraviolet; people have 3.
- Its sharpest vision resolves 5.77 cycles per degree: the finest stripe pattern it can tell apart from grey.
- Its eyes cover about 311° around the head, with 52° seen by both eyes at once.
- It stops seeing flicker at 91 Hz, against 60 Hz for people in this dataset, so fast motion looks about 1.5 times slower to it.[11][12]
- Activity pattern: diurnal.
The six dials
Evidence levels: how the tiers work. "Measured" means a value measured in this species; "Estimated" values come from a close relative or an eye-size formula.
| Dial | Value | Evidence | Sources |
|---|---|---|---|
| Colour | Colour receptors 4 receptor classes: 371.5 nm (UVS), 448 nm (SWS (blue)), 503 nm (MWS (green)), 563 nm (LWS (long)) measured in this species | Measured | [1][2] |
| Ultraviolet yes: at least one receptor peaks in the ultraviolet | Measured | ||
| Sharpness | Acuity 5.77 cycles per degree median of 2 relatives in family Paridae: Baeolophus bicolor, Poecile carolinensis | Estimated | [3] |
| Field of view | Binocular overlap 52° median of 2 relatives in family Paridae: Baeolophus bicolor, Poecile carolinensis | Estimated | [4] |
| Total field of view 311° median total field (measured, or 360 - blind area) of relatives in family Paridae: Poecile carolinensis, Baeolophus bicolor | Estimated | [5] | |
| Blind area behind the head 49° | Estimated | [5] | |
| Eye placement lateral | Estimated | [4] | |
| Sharp zones (foveas) | Number of foveas 1 median of 2 relatives in family Paridae: Baeolophus bicolor, Poecile atricapillus | Estimated | [6] |
| Fovea type single central fovea (displaced dorso-temporally from retinal centre) | Estimated | [6] | |
| Night vision | Activity pattern diurnal mode of 4 rows (of 4 rows): diurnal; not_nocturnal | Measured (not re-verified) | [7][8][2][9] |
| Rods vs cones cone-dominated nocturnal -> rod-dominated; crepuscular / cathemeral / mixed -> mixed; diurnal -> cone-dominated | Derived | [7][8][2][9] | |
| Motion (flicker fusion) | Flicker fusion frequency 91 Hz median of 2 bright-light rows (behavioural/whole-eye ERG rows; all rows: [75.3, 106.8]) | Measured (not re-verified) | [10] |
Other senses
- magnetoreception: NOT RENDERED (no agreed visual percept) (Group default)
Comparisons
Related animals
- European starling same vision type
- House sparrow same vision type
- American tree sparrow same vision type
- Brown-headed cowbird same vision type
- Chipping sparrow same vision type
- Dark-eyed junco same vision type
More birds: all birds with measured vision data.
Sources
- Lind O, Mitkus M, Olsson P, Kelber A. 2014. Ultraviolet vision in birds: the importance of transparent eye media. Proc R Soc B 281:20132209. Table 1. doi.org/10.1098/rspb.2013.2209
- Longcore T. 2023. A compendium of photopigment peak sensitivities and visual spectral response curves of terrestrial wildlife to guide design of outdoor nighttime lighting. Basic Appl Ecol 73:40-50. doi:10.1016/j.baae.2023.09.002. doi.org/10.5281/zenodo.8432720
- Caves EM, Brandley NC, Johnsen S (2018) Visual acuity and the evolution of signals. Trends Ecol Evol 33:358-372. Supplementary Tables S1-S3.. doi.org/10.1016/j.tree.2018.03.001
- Tyrrell LP, Fernandez-Juricic E 2017. Avian binocular vision: it's not just about what birds can see, it's also about what they can't. PLoS ONE 12(3): e0173235. S1 Table.. doi.org/10.1371/journal.pone.0173235
- Tyrrell LP, Moore BA, Loftis C, Fernandez-Juricic E 2017 (data 2017). The hawk-eyed songbird: retinal morphology, eye shape, and visual fields of an aerial insectivore. Am Nat 189(6). Dryad doi:10.5061/dryad.n7140.. doi.org/10.1086/691404
- Moore BA, Tyrrell LP, Pita D, Bininda-Emonds ORP, Fernandez-Juricic E 2017. Does retinal configuration make the head and eyes of foveate birds move? Sci Rep 7: 38406. Appendix 1.. doi.org/10.1038/srep38406
- Light conditions and the evolution of the visual system in birds (figshare dataset, SupplementaryDataset1). doi.org/10.6084/m9.figshare.22116371.v3
- Wilman H, Belmaker J, Simpson J, de la Rosa C, Rivadeneira MM, Jetz W. 2014. EltonTraits 1.0: species-level foraging attributes of the world's birds and mammals. Ecology 95:2027. BirdFuncDat.txt. doi.org/10.6084/m9.figshare.3559887.v1
- Moura et al. 2024. A phylogeny-informed characterisation of global tetrapod traits addresses data gaps and biases. PLoS Biol 22:e3002658. TetrapodTraits v3.0.1.. doi.org/10.5281/zenodo.22536349
- Boström JE, Dimitrova M, Canton C, Håstad O, Qvarnström A, Ödeen A. 2016. Ultra-rapid vision in birds. PLoS ONE 11(3): e0151099. S1 Table. doi.org/10.1371/journal.pone.0151099
- Healy K, McNally L, Ruxton GD, Cooper N, Jackson AL. 2013. Metabolic rate and body size are linked with perception of temporal information. Animal Behaviour 86:685-696. Table 1. doi.org/10.1016/j.anbehav.2013.06.018
- Inger R, Bennie J, Davies TW, Gaston KJ. 2014. Potential biological and ecological effects of flickering artificial light. PLoS ONE 9(5): e98631. Table 3. doi.org/10.1371/journal.pone.0098631
Every value cites its sources (all sources). Data: catalogue-v1, built 2026-09-29. Accuracy notes: how accurate is this?