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Cow vision: the science and the numbers

Bos taurus · order Artiodactyla · Mammals: all the numbers

Cows have 2 colour receptor classes (438 and 554 nm): mainly blues and yellows; reds and greens look alike.[1][2] Their sharpest vision resolves 4.98 cycles per degree, against 63.75 for people in this dataset.[5] Both eyes see the same 35.5° in front of them; a reflective layer (tapetum) helps in dim light.[8][9]

See it on your photoBack to How do cows see?
  • 2colour receptor classesMeasured
  • 4.98cycles per degree (sharpness)Measured
  • 35.5°seen by both eyesMeasured

The cow (Bos taurus) is a mammal in the order Artiodactyla. Its eyes belong to the vision type Grazing ungulate panorama: two cone types, a horizontal band of sharp vision and a near-panoramic field with a blind area behind the head. Measured in this species: colour, sharpness, field of view, foveas and night vision. Measured core: measured values on at least 3 of the 6 dials.

This is a simulation built from published eye measurements, not what the animal experiences.

Method: How we know what animals see (the See Like Animals vision engine) · Sources · Last updated . Every value below carries its evidence level and sources; nothing is typed by hand.

What cows see: colour receptors

Cow colour receptor peaks, 300 to 700 nmCow: 2 receptor peaks at 438, 554 nm; you: 3 at 421.5, 532, 558.4 nm. ultraviolet300400500600700
Cow: 438, 554 nmPeople: 421.5, 532, 558.4 nmWavelength in nanometres

What stands out

  • It has two colour receptor classes (a dichromat): reds and greens fall on one axis, as in red-green colour blindness in people.
  • Its sharpest vision resolves 4.98 cycles per degree: the finest stripe pattern it can tell apart from grey.
  • Both eyes see the same 35.5° in front of it (binocular overlap), where depth is judged best.
  • 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. The last column gives the values for people from the same catalogue.

Vision values for the cow (Bos taurus), catalogue-v1
DialValueEvidenceSourcesPeople
ColourColour receptors
2 receptor classes: 438 nm (VS/SWS (violet)), 554 nm (LWS (long))
measured in this species
Measured[1][2]Colour receptors: 3 receptor classes: 421.5 nm (VS/SWS (violet)), 532 nm (MWS (green)), 558.4 nm (LWS (long)) Measured (not re-verified)[1][3][2][4]
SharpnessAcuity
4.98 cycles per degree
median of 1 behavioural rows (method priority rule)
Measured[5]Acuity: 63.75 cycles per degree Measured[6][7]
Field of viewBinocular overlap
35.5°
median of 2 rows (eyes-at-rest rows preferred)
Measured[8][9]Binocular overlap: 122.5° Measured[8][9]
Total field of view: 200° Measured (not re-verified)[10]
Blind area behind the head: 160° Derived[10]
Eye placement: frontal Derived[8][9]
Total field of view
350°
group default: median total field of vision type the "Grazing ungulate panorama" type within phylum Chordata in species-v1: Equus caballus
Group default[11]
Blind area behind the head
10°		Group default[11]
Eye placement
lateral
frontal if binocular overlap >= 60 deg, else lateral
Derived[8][9]
Sharp zones (foveas)Number of foveas
0
fovea_present / area_centralis_type (retinal topography; count 1 = fovea present, 0 = none)
Measured[12]Number of foveas: 1 Measured[12]
Fovea type: fovea Measured[12]
Fovea type
anakatabatic area, area centralis, horizontal streak		Measured[12]
Night visionActivity pattern
diurnal
mode of 7 rows (of 7 rows): diurnal; photopic
Measured (not re-verified)[13][14][15][1][16][17]Activity pattern: diurnal Measured (not re-verified)[13][14][15][1][18][19][16][17]
Pupil shape: vertical Group default[20][21]
Reflective layer (tapetum): no Measured[22]
Rods vs cones: cone-dominated Derived[13][14][15][1][18][19][16][17]
Pupil shape
horizontal		Estimated[20]
Reflective layer (tapetum)
yes		Measured[23][24]
Rods vs cones
cone-dominated
nocturnal -> rod-dominated; crepuscular / cathemeral / mixed -> mixed; diurnal -> cone-dominated
Derived[13][14][15][1][16][17]
Motion (flicker fusion)Flicker fusion frequency
60 Hz
median of 1 relatives in family Bovidae: Ovis aries
Estimated[25]Flicker fusion frequency: 60 Hz Measured[26][27]

All mammals side by side: Mammals: every measurement. Method: how we know what animals see.

Sources

  1. Longcore 2023
  2. Müller et al. 2009
  3. Kirwan
  4. Thermal Activation and Photoactivation of Visual… 2004
  5. Caves et al. 2024
  6. Kirk et al. 2004
  7. Veilleux et al. 2014
  8. Heesy 2004
  9. Heffner et al. 1992
  10. Campbell & Green 1965
  11. Timney & Keil 1992
  12. Kopania et al. 2025
  13. Anderson et al. 2017
  14. Borges et al. 2018
  15. Wilman et al. 2014
  16. Schmitz et al. 2011
  17. Moura et al. 2024
  18. Maor et al. 2017
  19. Jones et al. 2009
  20. Banks et al. 2015
  21. Cervino et al. 2021
  22. Guareschi et al. 2025
  23. Fornazari et al. 2016
  24. Standard textbook knowledge
  25. Haarlem et al. 2026
  26. Healy et al. 2013
  27. Inger et al. 2014

Every value cites its sources (all sources). Values were extracted from these works and converted (units, medians, derived values); changes are ours, and the listed sources do not endorse this site. Data: catalogue-v1, built 2026-09-29. Accuracy notes: how accurate is this? Method: how we know.