Many ungulates have pale pelage, of various extents and shapes, on the buttocks (ischial surface, https://dictionary.cambridge.org/dictionary/english/ischial and https://www.merriam-webster.com/medical/ischial).
The following shows the location of the ischium, the posterior-most bone in the pelvic skeleton: https://afs.ca.uky.edu/livestock/dairy/skeletal
However, in this Post I exclude those cases in which the feature in question
In other words, I am particularly interested in those forms in which - at least in posteriolateral view - an ischial patch is the most conspicuous feature of colouration.
The following should serve for an approximate search-image: https://www.africaimagelibrary.com/-/galleries/east-africa/rwanda/-/medias/0253a725-2299-45bf-9a1e-8583be306b0a-defassa-waterbuck-kobus-ellipsiprymnus-defassa-akagera-natio.
The tail has particular potential as a complicating factor in the relative conspicuousness of the buttocks.
This is because the tail
Gazella arabicahttps://www.pixoto.com/images-photography/animals/other-mammals/arabian-gazelle--6523769179602944
Gazella maricahttps://www.flickr.com/photos/mikebarth/23973307372https://arabsstock.com/en/photos/image-79510-al-reem-gazelle-animal-one-nature-reserves-united-arab-emirates https://www.dreamstime.com/group-gazelles-group-beautiful-young-sand-gazelles-gazella-marica-park-arabian-peninsula-image193473128
Hippotragus niger
https://www.sciencephoto.com/media/389584/view/sable-antelope
https://www.agefotostock.com/age/en/details-photo/female-sable-antelope-hippotragus-niger-in-natural-habitat-south-africa/ESY-032086305
https://www.inaturalist.org/observations/180600325
https://www.inaturalist.org/journal/milewski/88983-does-the-sable-antelope-hippotragus-niger-possess-a-bleeze-part-1#
https://www.inaturalist.org/posts/85930-does-the-sable-antelope-hippotragus-niger-possess-a-bleeze-part-2-sexual-and-ontogenetic-development-of-the-ischio-abdominal-pattern-in-the-southern-sable-antelope-h-n-niger#
https://www.inaturalist.org/journal/milewski/86047-does-the-sable-antelope-hippotragus-niger-possess-a-caudal-flag#
Kobus defassa
This is perhaps the clearest-cut example of an ischial flag, among all the ungulates. However, even in this case, there is a compromising consideration. This is that Kobus ellipsiprymnus, which is often considered a subspecies of K. defassa, has a categorically different pattern on the hindquarters. Furthermore, the whitish pelage extends ventrally on to the upper hindlegs.
https://www.sciencephoto.com/media/389729/view/defassa-waterbuck
https://www.shutterstock.com/image-photo/defassa-waterbuck-looks-back-across-masai-2059418618
scroll in http://www.wildlife-of-africa.com/animals/defassa-waterbuck.htm
Gazella bennettii
https://www.shutterstock.com/image-photo/chinkara-gazella-bennettii-grasslands-2282490895
Antilope cervicapra
https://www.mediastorehouse.com.au/nature-picture-library/yashpal-rathore/blackbuck-antelope-cervicapra-male-18204719.html
https://www.dreamstime.com/black-buck-kid-portrait-green-back-ground-bucks-resident-species-gujarat-india-found-many-places-big-groups-image184881130
Ourebia ourebi
https://www.inaturalist.org/posts/70005-are-there-two-species-of-oribi-ourebia-instead-of-one#
https://www.inaturalist.org/posts/69937-adaptive-colouration-in-the-oribi-southern-forms-are-more-conspicuous-than-northern-forms#
https://www.inaturalist.org/posts/70860-summary-of-my-recent-observations-diagnostically-pale-features-on-the-hindquarters-of-bovid-bambis-ourebia-raphicerus-and-madoqua#
https://colombia.inaturalist.org/journal/milewski/70050-the-three-main-types-of-oribi-ourebia-at-a-glance#
Aepyceros melampus
Bos javanicus
The banteng (Bos javanicus) is the only member of the subfamily Bovinae that possesses an ischial flag.
This feature is somewhat sexually dimorphic. It is most distinct in mature males.
https://www.inaturalist.org/observations/166493287
https://www.inaturalist.org/observations/188475028
https://www.inaturalist.org/observations/179248772
https://www.inaturalist.org/observations/168830554
https://www.inaturalist.org/observations/166493285
https://www.inaturalist.org/observations/7859523
https://alchetron.com/cdn/banteng-ef6798a3-9044-4050-a190-db88f0eaf39-resize-750.jpeg
https://upload.wikimedia.org/wikipedia/commons/4/42/Bos_javanicus_5zz.jpg
https://www.gettyimages.com.au/detail/photo/java-banteng-wild-indonesia-bull-royalty-free-image/489133307?phrase=bos+javanicus&adppopup=true
https://www.agefotostock.com/age/en/details-photo/banteng-bull-bos-javanicus-asia/AAM-AAES72728
https://es.123rf.com/photo_76667652_male-banteng-has-the-red-to-the-black.html
https://www.shutterstock.com/image-photo/banteng-red-bull-southeast-asia-wild-730951786
https://www.istockphoto.com/video/bull-gm486265041-38243228
https://www.mindenpictures.com/stock-photo-banteng-bos-javanicus-birmanicus-taman-negara-malaysia-naturephotography-image90409137.html
https://es.123rf.com/photo_66402226_closeup-of-a-banteng-rear-with-part-of-the-tail.html
https://upload.wikimedia.org/wikipedia/commons/1/13/Burgers%27_Zoo_%2820190622125153%29.jpg
https://upload.wikimedia.org/wikipedia/commons/e/e8/Bos_javanicus%2C_%28wild%29_Banteng_-Huai_Kha_Khaeng%2820536293581%29.jpg
https://upload.wikimedia.org/wikipedia/commons/e/e8/Bos_javanicus%2C_%28wild%29_Banteng_-Huai_Kha_Khaeng%2820536293581%29.jpg
https://www.shutterstock.com/image-photo/closeup-banteng-rear-part-tail-471392174
https://www.istockphoto.com/photo/bull-gm461789365-32203682?phrase=banteng&searchscope=image%2Cfilm
https://www.istockphoto.com/photo/portrait-of-a-tropical-light-asian-cow-grazes-on-green-grass-gm1189814258-337029238?phrase=banteng&searchscope=image%2Cfilm
https://www.istockphoto.com/photo/portrait-of-a-tropical-light-asian-cow-grazes-on-green-grass-gm1181277550-331257613?phrase=banteng&searchscope=image%2Cfilm
https://www.istockphoto.com/photo/a-male-banteng-feeding-on-the-field-near-a-tropical-lake-gm1159085204-316827479?phrase=banteng&searchscope=image%2Cfilm
https://www.istockphoto.com/photo/banteng-group-in-wildlife-gm658436422-120078179?phrase=banteng&searchscope=image%2Cfilm
https://www.istockphoto.com/video/young-baby-banteng-bos-javanicus-or-red-bull-is-a-type-of-wild-cattle-gm1520309065-524558232?searchscope=image%2Cfilm
https://www.istockphoto.com/video/herd-busy-grazing-banteng-bos-javanicus-gm1443459763-482423282?searchscope=image%2Cfilm
https://www.istockphoto.com/photo/wild-banteng-and-family-in-green-field-gm1496586778-519211273?phrase=banteng&searchscope=image%2Cfilm
https://www.istockphoto.com/video/herd-busy-grazing-banteng-bos-javanicus-gm1443459763-482423282
https://www.istockphoto.com/video/bull-boss-javanicus-thailand-gm1442918809-482083889
https://www.istockphoto.com/video/banteng-bos-javanicus-also-called-the-tembadau-in-southeast-asia-listed-as-gm1293658924-387982694
https://www.istockphoto.com/video/bull-gm1133774100-301031465
https://www.dreamstime.com/royalty-free-stock-photography-banteng-image1533467
https://www.dreamstime.com/stock-photo-javan-banteng-bos-javanicus-also-known-as-tembadau-image86181298
https://www.dreamstime.com/stock-photo-banteng-bos-javanicus-redbull-forest-thailand-image42394646
https://www.dreamstime.com/royalty-free-stock-photo-banteng-calf-tree-investigates-large-trunk-image32372545
https://www.dreamstime.com/royalty-free-stock-images-male-banteng-stepping-out-wood-adult-grass-water-image34039839
https://www.shutterstock.com/image-photo/banteng-bos-javanicus-red-bull-type-2194049625
https://www.shutterstock.com/image-photo/back-view-female-banteng-cow-showing-2216844237
https://www.dreamstime.com/royalty-free-stock-photos-banteng-red-bull-wild-cattle-which-used-as-working-animal-found-southeast-asia-such-as-thailand-image36166918
https://upload.wikimedia.org/wikipedia/commons/2/2a/COLLECTIE_TROPENMUSEUM_Een_bantengstier_op_stal_TMnr_10023821.jpg
https://www.alamy.com/banteng-bos-javanicus-image547828619.html
https://www.earth.com/endangered-species/bos-javanicus/
https://www.gettyimages.com.au/detail/news-photo/december-2022-north-rhine-westphalia-cologne-the-banteng-news-photo/1245866350?adppopup=true
https://www.gettyimages.com.au/detail/photo/banteng-or-red-bull-southeast-asia-wild-life-animal-royalty-free-image/1367459782?phrase=bos+javanicus&adppopup=true
https://fictionrulezforever.fandom.com/wiki/Banteng?file=Banteng_%28Male%29.jpg
https://maker-scratchpad-youtube.fandom.com/wiki/Javan_Banteng?file=Javan_Banteng.jpg
https://www.bigstockphoto.com/image-191971720/stock-photo-javan-banteng-%28bos-javanicus%29%2C-also-known-as-the-tembadau
https://www.instagram.com/bloodorigins/p/C1kNoTZOyYb/
https://zootografiando.blogspot.com/2011/09/banteng.html
Dama dama
DISCUSSION
I know of no ungulate in which the buttocks are the only part of the stationary figure with conspicuous colouration.
There is no species of ungulate in which the conspicuous colouration on the buttocks constitutes, in itself, a bleeze.
This is because a bleeze is, by definition, more conspicuous than a flag. The buttocks are
Bleezes on the hindquarters often include the buttocks, but are never restricted to the buttocks.
The flag of Capreolus capreolus in winter pelage straddles the boundary between the buttocks and the rump (https://www.dreamstime.com/roe-deer-winter-scenery-roe-deer-winter-forest-scenery-image237055449 and https://www.shutterstock.com/image-photo/roe-deer-winter-1585340431).
Cervus elaphus exemplifies the same principle, differing only in detail.
https://www.alamy.com/male-red-deer-stag-in-old-forest-from-back-view-looking-aside-image355584145.html
In the case of Cervus nippon, the main part of the conspicuous feature is indeed on the buttocks, but there is a significant extension on to the base of a tail that is so short that a caudal flag is out of the question.
https://fishandhuntmaryland.com/articles/pursuit-sika-deer
https://www.bing.com/images/search?view=detailV2&ccid=GCxZg9PV&id=081BF38D6DFAFF42D916D52C9FD5D8A61A31ECC0&thid=OIP.GCxZg9PVcy6uGsfU0rQ8NAHaFK&mediaurl=https%3A%2F%2Fwww.wildlifeonline.me.uk%2Fassets%2Fugc%2Fimages%2Fsika_stag_speed.jpg&exph=845&expw=1212&q=sika+deer&simid=608050370566253003&form=IRPRST&ck=76A9FB41D31CB5D328E75D346DB99DB3&selectedindex=3&itb=0&ajaxhist=0&ajaxserp=0&vt=0&sim=11
https://bestpracticeguides.org.uk/deer-ecology/sika-deer/
Comments
Litocranius walleri
https://www.gettyimages.co.uk/detail/photo/cute-gerenuk-antelope-looking-back-in-the-brush-at-royalty-free-image/1336461194?phrase=gerenuk&adppopup=true
https://www.gettyimages.co.uk/detail/photo/gerenuk-stands-looking-out-over-sunny-savannah-royalty-free-image/1447467628?phrase=gerenuk&adppopup=true
https://www.gettyimages.co.uk/detail/photo/gerenuk-stands-on-sunny-savannah-watching-camera-royalty-free-image/1447737605?phrase=gerenuk&adppopup=true
https://www.gettyimages.co.uk/detail/photo/gerenuk-stands-looking-out-across-sunny-savannah-royalty-free-image/1447737601?phrase=gerenuk&adppopup=true
https://www.gettyimages.co.uk/detail/photo/gerenuk-stands-on-savannah-turning-towards-camera-royalty-free-image/1447737614?phrase=gerenuk&adppopup=true
https://www.gettyimages.co.uk/detail/photo/gerenuk-stands-eyeing-camera-with-bushes-behind-royalty-free-image/1447467634?phrase=gerenuk&adppopup=true
https://www.gettyimages.co.uk/detail/photo/gerenuk-stands-facing-camera-on-sunny-savannah-royalty-free-image/1447737621?phrase=gerenuk&adppopup=true
https://www.gettyimages.co.uk/detail/photo/gerenuk-stand-on-hind-legs-against-tree-royalty-free-image/523711312?phrase=gerenuk&adppopup=true
Shift to Post on bipedality
https://www.gettyimages.co.uk/detail/news-photo/gerenuk-the-gazelle-being-fed-at-bellevue-zoo-october-1948-news-photo/591977566?adppopup=true
Shift to Post on flehmen
https://www.gettyimages.co.uk/detail/photo/gerenuk-litocranius-walleri-male-flehmen-samburu-royalty-free-image/521340834?phrase=gerenuk&adppopup=true
CAUDAL FLAGS IN WHICH THE ISCHIAL COLOURATION IS MERELY ADJUNCT; part 1
Capra
http://www.china.org.cn/environment/2015-12/07/content_37251394_6.htm
https://www.wilddocu.de/central-asian-ibex-capra-sibirica-alaiana/
https://www.shutterstock.com/image-photo/siberian-ibex-capra-sibirica-beautiful-asiatic-2406331599
https://www.wilddocu.de/wp-content/uploads/2016/07/Capra_nubiana_011.jpg
https://www.imago-images.com/st/0151697535
https://www.alamy.com/walia-ibex-capra-walie-male-on-steep-mountain-slope-simien-mountains-image154472136.html
https://alchetron.com/Walia-ibex
https://www.alamy.com/walia-ibex-capra-walie-male-feeding-on-steep-mountain-slope-simien-image154472066.html
Record of swimming in Alouatta
From about 1 hour 25 minutes in https://rumble.com/v48x7xq-the-209th-evolutionary-lens-with-bret-weinstein-and-heather-heying.html
CAUDAL FLAGS IN WHICH THE ISCHIAL COLOURATION IS MERELY ADJUNCT, part 2
https://www.inaturalist.org/observations/68777851
https://www.inaturalist.org/observations/191834679
https://www.inaturalist.org/observations/32828313
https://www.alamy.com/a-selective-focus-of-jumping-female-blackbuck-behind-male-ones-with-ringed-horns-in-jayamangali-blackbuck-reserve-image502260206.html?imageid=B8681540-D690-4271-914C-8145C6B49EE5&p=829514&pn=1&searchId=2066ccd4a87acaee839e09a5bfa4a1dc&searchtype=0
https://www.projectnoah.org/spottings/1187206004/fullscreen
https://www.dreamstime.com/flock-black-bucks-desert-black-buck-also-known-as-indian-antelope-antelope-native-to-pakistan-india-image254598626
https://timesofindia.indiatimes.com/city/chennai/proposal-to-declared-3-reserve-forests-as-blackbuck-sanctuaries/articleshow/61166913.cms
https://www.istockphoto.com/photo/wild-female-blackbuck-or-antilope-cervicapra-or-indian-antelope-back-profile-with-gm1589558357-529316592?phrase=blackbuck+antelope+leaping&searchscope=image%2Cfilm
https://www.shutterstock.com/image-photo/young-blackbuck-jumping-park-1135055432
https://www.animalsaroundtheglobe.com/gorilla-vs-blackbuck/
https://www.dreamstime.com/indian-blackbuck-antelope-cervicapra-indian-antelope-indian-blackbuck-antelope-cervicapra-indian-antelope-blackbuck-image214704989
https://www.dreamstime.com/indian-blackbuck-antelope-cervicapra-indian-antelope-indian-blackbuck-antelope-cervicapra-indian-antelope-blackbuck-image222246450
https://www.dreamstime.com/black-buck-doe-black-buck-doe-antelope-wild-image100203627
https://www.dreamstime.com/male-blackbuck-antelope-pampas-plain-environment-la-pampa-province-argentina-image249197263
https://www.dreamstime.com/male-blackbuck-antelope-pampas-plain-environment-la-pampa-province-argentina-image249197263
https://www.alamy.com/stock-photo-lone-male-black-buck-79244774.html?imageid=1DA253F2-FAC2-4E74-B17E-4C7D41F027E4&p=96151&pn=1&searchId=9fb718e749de9713c7204c94e5528eda&searchtype=0
https://www.gettyimages.co.nz/detail/photo/close-up-portrait-of-owl-perching-in-field-behind-royalty-free-image/1394254779?phrase=african+grass+owl&adppopup=true
https://www.sciencephoto.com/media/1228165/view/grant-s-gazelle-looking-at-the-savannah
https://www.alamy.com/a-young-black-tail-buck-near-eugene-oregon-usa-image311351501.html?imageid=09470458-612E-495F-9FEC-359B85880EED&p=200193&pn=1&searchId=9fb718e749de9713c7204c94e5528eda&searchtype=0
https://www.nature.com/articles/s41598-020-58681-5
https://www.istockphoto.com/photo/nilgai-or-indian-blue-bull-on-desert-area-gm827337732-134450339?phrase=nilgai&searchscope=image%2Cfilm
https://www.flickr.com/photos/aeschylus18917/3214819925
https://www.istockphoto.com/photo/nilgai-calf-gm1471409366-502019244?phrase=nilgai&searchscope=image%2Cfilm
https://www.istockphoto.com/photo/nilgai-in-the-forest-gm1787778327-547488129?phrase=nilgai&searchscope=image%2Cfilm
https://www.istockphoto.com/photo/closeup-shot-of-a-brown-nilgai-looking-at-the-camera-in-the-field-gm1461025676-495084255?phrase=nilgai&searchscope=image%2Cfilm
https://www.istockphoto.com/video/banteng-bos-javanicus-or-red-bull-is-a-type-of-wild-cattle-gm1807843916-549024059?searchscope=image%2Cfilm
Pseudois nayaur
https://www.istockphoto.com/photo/himalayan-blue-sheep-in-himalayas-gm1247650759-363351816?phrase=bharal&searchscope=image%2Cfilm
https://www.istockphoto.com/photo/bharal-or-himalayan-blue-sheep-or-naur-gm1064043138-284482851?phrase=bharal&searchscope=image%2Cfilm
https://www.istockphoto.com/photo/wild-blue-sheep-in-tibet-gm1400181718-453834491?phrase=bharal&searchscope=image%2Cfilm
https://observation.org/media/photo/4531214.jpg
https://www.shutterstock.com/image-photo/two-gemsbok-bulls-facing-each-other-2315383143
https://www.shutterstock.com/image-photo/vast-open-dry-plains-large-herd-2414448681
https://www.shutterstock.com/image-photo/herd-gemsbok-dry-auob-river-bed-737345608
https://www.shutterstock.com/image-photo/gemsbok-dry-bed-auob-river-kgalagadi-1770923984
https://www.shutterstock.com/image-photo/gemsbok-orange-sand-dune-evening-sunset-1277671426
https://www.shutterstock.com/image-photo/gemsbok-oryx-gazella-kgalagadi-transfrontier-park-2399776539
ELAPHODUS CEPHALOPHUS
https://www.mediastorehouse.com.au/ardea-wildlife-pets-environment/tufted-deer-1830543.html
https://www.dreamstime.com/stock-photo-elaphodus-cephalophus-cephalophusr-shangri-la-yunnan-china-image94617768
https://avk.wikipedia.org/wiki/Akusumol_%28Elaphodus_cephalophus_michianus%29#/media/Iyeltak:Elaphodus_cephalophus_michianus_Magdeburg_zoo_20.10.2012_03.jpg
https://www.mindenpictures.com/stock-photo-tufted-deer-elaphodus-cephalophus-male-showing-tusks-fang-like-naturephotography-image90856737.html
https://calphotos.berkeley.edu/cgi/img_query?enlarge=0000+0000+0113+1522
https://www.imago-images.com/st/0106706732
https://upload.wikimedia.org/wikipedia/commons/6/69/Elaphodus_cephalophus_Side_view_Columbus_Zoo_2010-05-21.JPG
https://uk.inaturalist.org/observations/17921702
Second photo in https://uk.inaturalist.org/observations/133304701
https://uk.inaturalist.org/observations/149964381
https://uk.inaturalist.org/observations/144734641
OUREBIA MONTANA
https://s3.animalia.bio/animals/photos/full/original/sudan-oribi-ourebia-montana.webp
https://www.inaturalist.org/guide_taxa/841819
https://www.gettyimages.com.au/detail/news-photo/brazil-southern-pantanal-caiman-ranch-pampas-deer-news-photo/453512084?adppopup=true
Ozotoceros bezoarticus
https://2.bp.blogspot.com/-O9IMFzllq44/UIKSzbqCnTI/AAAAAAAACRo/cBRG4ANW2o8/s1600/pampas_deer+(2).JPG
https://www.sciencephoto.com/media/493604/view/pampas-deer-in-a-meadow
https://www.gettyimages.com.au/detail/photo/pampas-deer-serra-da-canastra-national-park-brazil-royalty-free-image/128122169?phrase=pampas+deer&adppopup=true
https://www.gettyimages.com.au/detail/photo/pampas-deer-royalty-free-image/1185912037?phrase=pampas+deer&adppopup=true
https://www.gettyimages.com.au/detail/photo/pampas-deer-royalty-free-image/1185912525?phrase=pampas+deer&adppopup=true
@dejong @simontonge @matthewinabinett
As far as I know, this is the first time this phenomenon has ever been recorded in this species.
FLARED ISCHIAL FLAG IN OUREBIA MONTANA
https://www.dreamstime.com/royalty-free-stock-photos-running-impala-image4326258
Flaring of an ischial flag has previously been recorded in Gazella spp., Raphicerus campestris, Madoqua guentheri, and Ourebia ourebi. However, I have never previously seen evidence of it in Ourebia montana or Ourebia quadriscopa, which have a small ischial patch of white pelage.
Also please see (likewise O. montana mislabelled as impala):
https://www.dreamstime.com/impala-family-grass-landscape-kenyan-savannah-image147213431
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