@michalsloviak @tonyrebelo @alanhorstmann @maxallen @colin25 @chewitt1 @johnnybirder @jwidness @jakob @jeremygilmore @mgargiulo
...continued from https://www.inaturalist.org/posts/68122-interspecific-variation-in-the-form-of-the-chestnut-among-equids-part-1#
As far as I know, nobody has previously examined the chestnut (https://en.wikipedia.org/wiki/Chestnut_(horse_anatomy)) in the plains zebra (Equus quagga).
The chestnut seems to vary in two different ways within this species.
Firstly, it varies in size, with the chestnut of Equus quagga crawshayi tending to be anomalously small (albeit with individual variation).
Secondly, it varies in the degree to which it is obscured by the striping on the upper foreleg.
As a result, the chestnut is
In E. q. quagga and E. q. burchellii, the chestnut is
In E. q. crawshayi and E. q. borensis, the chestnut is almost as inconspicuous as in Equus zebra (https://www.shutterstock.com/image-photo/cape-mountain-zebra-equus-national-park-1282130179), Equus hartmannae (https://fossilrimblog.files.wordpress.com/2014/04/rs2686_12-5.jpg), and Equus grevyi (https://www.alamy.com/full-body-side-view-of-grevy-zebra-walking-in-the-bush-in-samburu-in-kenya-image364435205.html and https://www.alamy.com/stock-photo-grevys-zebra-equus-grevyi-122867476.html?imageid=30B3BEAA-C495-4E68-8C91-71131C44329B&p=354315&pn=2&searchId=4dda47820ae27bc9059f9c91451c28a7&searchtype=0).
The two northernmost subspecies, E. q. boehmi of the Serengeti, and E. q. borensis of the borders of Kenya with Uganda, Sudan, and Ethiopia, have similar striping. Their main difference is the tendency to manelessness in E. q. borensis. It is therefore somewhat surprising that the chestnut is usually obscured by the relatively bold striping in E. q. borensis (https://www.flickr.com/photos/j-l-t-photography/29554465761), to an extent not usually seen in E. q. boehmi (https://zooinstitutes.com/animals/grants-zebra-wildlands-adventure-zoo-emmen-37259.html).
Perhaps the biggest surprise is that, in at least some individuals of E. q. crawshayi, the chestnut is hardly visible (https://www.alamy.com/crawshays-zebra-in-south-luangwa-national-park-zambia-image357741827.html).
QUAGGA
The chestnut is conspicuous, partly because the forelegs are whitish and lack striping.
http://www.mwnh.de/imag/mus085.jpg
https://www.extinctanimals.org/wp-content/uploads/2015/07/Quagga-Zebra.jpg
Scroll to Wiesbaden specimen in http://breedingback.blogspot.com/2013/10/normal-0-21-false-false-false-de-ja-x_31.html
The following painting of the extinct quagga, reputedly made using a real captive specimen as model, confirms a conspicuous chestnut owing to fairly large size and dark tone.
BURCHELLII
https://www.timbrowntours.com/wp-content/uploads/2014/06/Zebra-crossing-road-on-our-Durban-Big-5-Private-Day-Safari-Tour-to-Hluhluwe-Umfolozi-Big-5-Game-reserve-28th-June-2014.jpg
https://www.dreamstime.com/royalty-free-stock-photos-burchell-zebra-side-profile-portrait-image25158388
https://www.alamy.com/zebra-at-etosha-national-park-namibia-image465034743.html?imageid=F50C35B3-6037-46D3-BC99-8F2FC8EF1477&p=310546&pn=2&searchId=4dda47820ae27bc9059f9c91451c28a7&searchtype=0
https://www.shutterstock.com/image-photo/plains-zebra-common-equus-quagga-formerly-1681478740
http://thumb9.shutterstock.com/display_pic_with_logo/1215434/190604102/stock-photo-burchells-zebra-walking-190604102.jpg
https://www.robertharding.com/preview/743-601/burchells-zebra-foal-equus-burchelli-redbilled-oxpeckers-buphagus/
CHAPMANI
https://www.istockphoto.com/photo/zebra-portrait-gm489981636-74972167
https://www.bigstockphoto.com/image-416280568/stock-photo-common-zebra-%28equus-quagga%29-walking-in-green-savanna-in-kruger-national-park-south-africa
https://www.alamy.com/adult-zebra-with-muddy-hooves-walking-near-a-waterhole-in-kruger-park-in-south-africa-image370697264.html?imageid=D3F2C754-B599-4A7B-BEE7-234897F618BB&p=4830&pn=1&searchId=a66e4b9a64c576eb6a53858abf65ed24&searchtype=0
https://www.alamy.com/three-zebras-walking-in-staggered-tandem-image220478276.html?imageid=1D3CF339-2340-4E8D-A93A-EEFF5A1C8342&p=365196&pn=2&searchId=4dda47820ae27bc9059f9c91451c28a7&searchtype=0
https://www.shutterstock.com/image-photo/small-zebra-foal-standing-oxpecker-on-278165210
http://thumbs.dreamstime.com/x/1233293http://www.dreamstime.com/stock-photos-zebras-profile-one-bendin-1233293.jpg
CRAWSHAYI
https://www.naturepl.com/stock-photo-crawshay-39-s-zebra-equus-quagga-crawshayi-eating-a-fruit-sausage-nature-image01644679.html
http://www.africaimagelibrary.com/media/f8641cf6-4696-4271-8792-38febc5e91ee-crawshay-s-zebra-equus-quagga-crawshayi-south-luangwa-natinal
https://travelswithben.com/2018/07/18/zebras-at-south-luangwa-national-park-zambia/
https://www.alamy.com/stock-photo-crawshays-zebra-foal-equus-quagga-crawshayi-south-luangwa-national-86003548.html
https://www.alamy.com/stock-photo-crawshays-zebra-equus-quagga-crawshayi-adult-standing-on-grassland-70270064.html
https://www.alamy.com/stock-photo-crawshay-zebra-equus-quagga-crawshaii-south-luangwa-national-park-88590529.html
https://www.alamy.com/chapmans-zebra-equus-quagga-chapmani-standing-on-the-dry-arid-empty-savannah-in-south-luangwa-national-park-zambia-image369897300.html?imageid=0C5C1FA5-2CC5-490E-BB64-BDCD30342B78&p=364701&pn=13&searchId=23ce11cb0d23a1b3922b090004c28a43&searchtype=0
https://www.alamy.com/stock-photo-crawshaw-zebra-south-luangwa-national-park-zambia-12150521.html?imageid=86CE7F1D-3DE8-4BA3-B765-5D8C38CF8743&p=33444&pn=1&searchId=c1ba876f280b14f5c4ef1c76cfd026ee&searchtype=0
https://www.alamy.com/crawshays-zebras-equus-quagga-crawshayi-in-south-luangwa-national-park-in-eastern-zambia-image344311950.html
https://www.alamy.com/stock-photo-crawshays-zebra-equine-grazer-herbivore-plains-zebra-subspecies-south-33136534.html
http://www.photo-thierry-riols.com/galleries/images_slider/zebre-de-crawshay-luangwa-zambie_d4a6611-1268.jpg
http://c8.alamy.com/comp/E29254/crawshays-zebra-equus-quagga-crawshayi-adult-standing-on-grassland-E29254.jpg
http://cdn26.us1.fansshare.com/photo/nyikaplateaunationalpark/zebra-wildlife-malawian-style-malawi-national-parks-reserves-nyika-national-park-nyika-plateau-national-park-2065319918.jpg
https://vijilworldtour.files.wordpress.com/2015/06/dscn4477.jpg
https://www.alamy.com/crawshays-zebras-equus-quagga-crawshayi-face-to-face-south-luangwa-national-park-zambia-image229348460.html
Scroll in https://adventuresoflilnicki.com/south-luangwa-national-park-zambia/
https://www.alamy.com/zebras-in-south-luangwa-park-mfuwe-zambia-image264492274.html
https://www.canstockphoto.com/trio-of-zebra-4842521.html
https://www.flickr.com/photos/149768393@N06/47155200411/
https://www.alamy.com/crawshays-zebra-in-south-luangwa-national-park-zambia-image357741579.html
https://pixels.com/featured/zebras-south-luangwa-david-stribbling.html?product=puzzle&puzzleType=puzzle-18-24
BOEHMI
http://previews.123rf.com/images/ryanfaas/ryanfaas1212/ryanfaas121200050/16916644-Lone-zebra-equus-quagga-walking-through-the-African-Bush-Stock-Photo.jpg
https://www.dreamstime.com/common-zebra-kenya-walks-across-grasslands-winter-common-zebra-kenya-walks-across-grasslands-winter-africa-image169428299
https://es.123rf.com/photo_144727932_common-zebra-in-masai-mara-national-park-in-kenya-africa.html
https://www.dreamstime.com/stock-photo-adult-common-zebra-ngorongoro-crater-tanzania-image29477920
https://www.alamy.com/stock-photo-captive-zebra-eating-hay-at-dublin-zoo-ireland-35006072.html?imageid=A47121D3-0EBF-44DE-A748-07E7B7285074&p=88542&pn=1&searchId=a66e4b9a64c576eb6a53858abf65ed24&searchtype=0
https://www.alamy.com/zebra-mare-grazing-with-young-foal-alongside-neck-rubbing-within-the-image1700320.html?imageid=3C5A64B1-895C-457B-AAF2-A5E51D5BFBCE&p=5983&pn=5&searchId=b0607eab4a971228f9dfd9d4a015e77d&searchtype=0
https://www.shutterstock.com/image-photo/zebra-standing-walking-throught-grassland-1325040209
https://www.shutterstock.com/image-photo/zebra-africa-13716499
https://www.shutterstock.com/image-photo/zebra-grazing-serengeti-national-park-tanzania-1078886912
https://www.shutterstock.com/image-photo/plains-zebra-equus-quagga-on-savannah-119385064
https://targetstudy.com/files/img/34/154/M_55.jpg
http://thumb1.shutterstock.com/display_pic_with_logo/777052/278989304/stock-photo-zebra-equus-quagga-walking-on-savanna-at-sunrise-serengeti-national-park-tanzania-278989304.jpg
http://tanzania-budget-safaris.com/wp-content/uploads/2012/03/Zebra-in-Manyara-National-park1.jpg
http://payload136.cargocollective.com/1/7/243717/5032000/zebra.jpg
BORENSIS
https://www.wikidata.org/wiki/Q3751810#/media/File:Equus_quagga_borensis_at_Borysew_Zoo.jpg
http://www.wildafrica.sk/index_soubory/KIDEPO%20MANELESS%20ZEBRA/album/slides/DSC_9386_resize.JPG4
https://upload.wikimedia.org/wikipedia/commons/thumb/2/2f/Maneless_zebras_at_Kidepo_Valley_NP_-Uganda.jpg/220px-Maneless_zebras_at_Kidepo_Valley_NP-_Uganda.jpg 5
http://media-cdn.tripadvisor.com/media/photo-s/03/69/4f/ee/kidepo-valley-national.jpg/
http://www.biopix.com/equus-quagga-borensis_photo-74579.aspx
http://static1.squarespace.com/static/5395f864e4b0ac0017b952d3/t/53f38c1be4b09eb7f5883e86/1408470056195/
http://i.livescience.com/images/i/000/073/348/original/Kidepo-Valley-NP-Uganda.jpeg?1421208493
https://www.zoochat.com/community/media/maneless-zebra-equus-quagga-borensis.204226/
https://www.zoochat.com/community/media/maneless-zebra-colchester-29th-july-2019.452201/
https://parody.fandom.com/wiki/Maneless_Zebra?file=Zebra%252C_Manless.jpg
Comments
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https://www.istockphoto.com/photo/butt-of-a-gr%C3%A9vy-or-imperial-zebra-community-gm178188420-25104551?phrase=grevys%20zebra
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https://www.dreamstime.com/zebra-profile-to-side-zebra-profile-head-eyes-seen-kruger-park-image177130232
https://www.alamy.com/stock-photo-mule-with-zebra-stripes-andalusia-spain-europe-16629056.html?imageid=09C10F25-016A-4551-B68C-C25AF9DAFE83&p=54789&pn=1&searchId=a66e4b9a64c576eb6a53858abf65ed24&searchtype=0
Shift
https://www.alamy.com/a-zebra-relaxes-in-the-late-summer-sunshine-image454465157.html?imageid=F692D0D0-E75E-45A8-AD80-A12841D3DC2C&p=1737621&pn=1&searchId=a66e4b9a64c576eb6a53858abf65ed24&searchtype=0
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https://www.alamy.com/zebra-wallowing-on-the-dusty-ground-funny-animal-africa-image360387065.html?imageid=3A810E80-86E0-42AF-A411-94B0A83BE709&p=1284029&pn=1&searchId=a66e4b9a64c576eb6a53858abf65ed24&searchtype=0
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https://www.alamy.com/zebra-at-the-zoo-image431133417.html?imageid=115ED6F6-8398-4818-A84D-91445463DFE0&p=411097&pn=2&searchId=4dda47820ae27bc9059f9c91451c28a7&searchtype=0
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https://www.alamy.com/zebra-image61275307.html?imageid=E85CD216-5184-4CB1-8053-CBD635A5E388&p=39611&pn=4&searchId=a54af3dc1075c451c22c6909a3928313&searchtype=0
https://www.shentonsafaris.com/blog/zebras-of-south-luangwa/
Shift
Good illustration of caudal flag in Panthera pardus: https://www.alamy.com/walking-leopard-panthera-pardus-south-luangwa-national-park-mfuwe-zambia-africa-image386008200.html?imageid=8FAB737E-BE3B-44AB-AAA8-F771CF389697&p=57165&pn=6&searchId=f5e7397442b326e3880c1f3b41c85c81&searchtype=0.
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Excellent illustration of inconspicuous colouration in Aepyceros melampus:
https://www.alamy.com/stock-photo-two-impalas-aepyceros-melampus-young-south-luangwa-national-park-zambia-73796200.html?imageid=F0BEB579-7453-4E54-9638-BF862EB3A0B4&p=53352&pn=9&searchId=375bb8a9bd33e3af6badde19e4827ef0&searchtype=0.
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