File:Eyeshine in Felis catus (domestic cat) (Newark, Ohio, USA) 7 (47665510552).jpg
Eyeshine_in_Felis_catus_(domestic_cat)_(Newark,_Ohio,_USA)_7_(47665510552).jpg (542 × 282 pixels, file size: 135 KB, MIME type: image/jpeg)
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Summary
[edit]DescriptionEyeshine in Felis catus (domestic cat) (Newark, Ohio, USA) 7 (47665510552).jpg |
Bright yellow eyeshine in Felis catus Linnaeus, 1758 - domestic cat in Newark, Ohio, USA. Mammals are the dominant group of terrestrial vertebrates on Earth today. The group is defined based on a combination of features: endothermic (= warm-blooded), air-breathing, body hair, mother's milk, four-chambered heart, large brain-to-body mass ratio, two teeth generations, differentiated dentition, and a single lower jawbone. Almost all modern mammals have live birth - exceptions are the duck-billed platypus and the echidna, both of which lay eggs. Mammals first appear in the Triassic fossil record - they evolved from the therapsids (mammal-like reptiles). Mammals were mostly small and a minor component of terrestrial ecosystems during the Mesozoic. After the Cretaceous-Tertiary mass extinction at 65 million years ago, the mammals underwent a significant adaptive radiation - most modern mammal groups first appeared during this radiation in the early Cenozoic (Paleocene and Eocene). Three groups of mammals exist in the Holocene - placentals, marsupials, and monotremes. Other groups, now extinct, were present during the Mesozoic. Seen here is a domestic cat, Felis catus. Light from the camera flash has resulted in bright yellowish-colored eyes. Eyeshine in cats is caused by a reflective layer of tissue behind the retina at the back of the eye. This tissue layer is called the tapetum lucidum ("tapestry of light"). It reflects light back toward the light-sensitive cells of the retina to boost night vision capability. Classifiation: Animalia, Chordata, Vertebrata, Mammalia, Carnivoria, Felidae More info. at: <a href="https://en.wikipedia.org/wiki/Tapetum_lucidum" rel="noreferrer nofollow">en.wikipedia.org/wiki/Tapetum_lucidum</a> and Ollivier et al. (2004) - Comparative morphology of the tapetum lucidum (among selected species). Veterinary Ophthalmology 7: 11-22. |
Date | |
Source | Eyeshine in Felis catus (domestic cat) (Newark, Ohio, USA) 7 |
Author | James St. John |
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This image was originally posted to Flickr by James St. John at https://flickr.com/photos/47445767@N05/47665510552 (archive). It was reviewed on 10 December 2019 by FlickreviewR 2 and was confirmed to be licensed under the terms of the cc-by-2.0. |
10 December 2019
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Date/Time | Thumbnail | Dimensions | User | Comment | |
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current | 01:49, 10 December 2019 | 542 × 282 (135 KB) | Ser Amantio di Nicolao (talk | contribs) | Transferred from Flickr via #flickr2commons |
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Metadata
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Camera manufacturer | Canon |
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Camera model | Canon PowerShot D10 |
Exposure time | 1/60 sec (0.016666666666667) |
F-number | f/2.8 |
ISO speed rating | 80 |
Date and time of data generation | 20:29, 21 April 2019 |
Lens focal length | 6.2 mm |
Width | 4,000 px |
Height | 3,000 px |
Bits per component |
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Pixel composition | RGB |
Orientation | Normal |
Number of components | 3 |
Horizontal resolution | 180 dpi |
Vertical resolution | 180 dpi |
Software used | Adobe Photoshop Elements 16.0 (Macintosh) |
File change date and time | 13:11, 27 April 2019 |
Y and C positioning | Co-sited |
Exif version | 2.21 |
Date and time of digitizing | 20:29, 21 April 2019 |
Meaning of each component |
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Image compression mode | 3 |
APEX shutter speed | 5.90625 |
APEX aperture | 2.96875 |
APEX exposure bias | −0.66666666666667 |
Maximum land aperture | 2.96875 APEX (f/2.8) |
Metering mode | Pattern |
Flash | Flash fired, compulsory flash firing, red-eye reduction mode |
Supported Flashpix version | 1 |
Color space | sRGB |
Focal plane X resolution | 16,460.905349794 |
Focal plane Y resolution | 16,483.516483516 |
Focal plane resolution unit | inches |
Sensing method | One-chip color area sensor |
File source | Digital still camera |
Custom image processing | Normal process |
Exposure mode | Manual exposure |
White balance | Auto white balance |
Digital zoom ratio | 1 |
Scene capture type | Portrait |
Lens used | 6.2-18.6 mm |
Date metadata was last modified | 09:11, 27 April 2019 |
Unique ID of original document | 60225F93EE1FC68FF4A437FA8271C477 |