A photo-comparison of bleezes and flags in the blesbok versus the bontebok

(writing in progress)

The following photo-pair shows the two subspecies in posteriolateral view.

Both have a facial bleeze, that of the blesbok being proportionately larger owing to the difference in the relative sizes of the head.

The bontebok has an extremely well-developed pedal flag, whereas this individual of the blesbok, viewed in this perspective, lacks a pedal flag.

The pygal flag of the blesbok is replaced by a pygal bleeze in the bontebok.

In the blesbok, the abdominal and ulnar flags are separate, but in the bontebok there is a white ventral panel that subsumes both the abdominal and the ulnar pattern.

Blesbok
https://www.flickr.com/photos/dorneyphoto/49990958018/in/photolist-2jawJah-Hg63fU-bpxo9b-akqXjc-kDZnJt-8UcSMq-Sgocj4-2hdX4hz-2hRvAAH-2nqxXKA-2k7THja-2nFTwAK-NtcqZw-2mKwoFx-K9H7kw-2nYaeMv-2jbEesL-2jbJeMK-NwubQy-FGdmr3-CMZ9sW-2mVjjPf-ThNHJU-21La8WY-8xnKqU-eMntC3-KA9iEt-2kYpdSu-bsgrmu-2jxYMd5-b3zx7T-2hQhV25-jyHrKJ-2k5VFg7-5sqULW-2fkJEYZ-2kPChVk-21DVXBL-dRVYii-2kvQbEc-yRBxjS-EjKxsR-7cWLgq-21oyHh4-oD1wzM-eijdtU-2gmKAXS-7y3c7F-frYRFL-MdmiNW

Bontebok
https://www.inaturalist.org/observations/130669553

POSTERIOLATERAL VIEW

Blesbok
https://www.inaturalist.org/observations/5141221 and https://www.inaturalist.org/observations/10924282

Blesbok
https://www.inaturalist.org/observations/31573500

Blesbok
https://www.inaturalist.org/observations/85742476

Blesbok
https://www.inaturalist.org/observations/7916986

Blesbok
https://www.inaturalist.org/observations/71536880

Adult male bontebok
https://www.inaturalist.org/observations/115575412

https://www.inaturalist.org/observations/110874507

(writing in progress)

For an index to my many Posts about the genus Damaliscus, please see https://www.inaturalist.org/journal/milewski/78238-an-index-to-my-posts-on-genus-damaliscus#.

Posted on March 03, 2023 12:47 PM by milewski milewski

Comments

@tonyrebelo @paradoxornithidae

The following of the bontebok is a fair illustration of the relatively small head (compared to the blesbok), and an excellent illustration of the divulgence of advanced pregnancy by the white feature on the belly:

https://www.inaturalist.org/observations/97905171

Pregnancy is evident even in posterior view:

https://www.inaturalist.org/observations/68890585

Posted by milewski 12 months ago

Both the blesbok and the bontebok possess a facial bleeze.

However, I hypothesise that the facial bleeze of the blesbok is proportionately larger than that of the bontebok.

Furthermore, I hypothesise that the reason for this difference is that the head of the blesbok is proportionately larger than that of the bontebok.

If the ear pinnae of the blesbok and the bontebok have similar absolute sizes, then it should be possible to see, in suitably illuminated photos, that the ear pinnae of the blesbok are smaller, relative to the facial blaze, than that of the bontebok.

Dear Readers, please scrutinise the following photos to see whether the blesbok and the bontebok differ in the size of the ear pinnae relative to that of the main whitish patch on the face.

BLESBOK

https://www.inaturalist.org/observations/89697800

https://www.inaturalist.org/observations/103644334

https://www.inaturalist.org/observations/86025356

https://www.inaturalist.org/observations/80193154

https://www.inaturalist.org/observations/39219051

https://www.inaturalist.org/observations/36770861

https://www.inaturalist.org/observations/6436829

BONTEBOK

https://www.inaturalist.org/observations/137505998

https://www.inaturalist.org/observations/69061967

https://www.inaturalist.org/observations/67749842

https://www.inaturalist.org/observations/51830740

https://www.inaturalist.org/observations/55170710

https://www.inaturalist.org/observations/47826356

https://www.inaturalist.org/observations/32097081

Posted by milewski 12 months ago

Swishing of the tail vs insects, which I do not regard as indicative of a caudal flag:

https://www.inaturalist.org/observations/43411252

Posted by milewski 12 months ago

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