The pedaxillosternal flag of the Rocky Mountain mule deer (Odocoileus hemionus hemionus)

The Rocky Mountain mule deer (Odocoileus hemionus hemionus) is well-known to have a conspicuous pattern of colouration on the hindquarters.

This is most noticeable in the winter pelage, and in posteriolateral view (https://www.inaturalist.org/observations/97295280 and https://www.inaturalist.org/observations/72504627 and https://www.inaturalist.org/observations/68344771 and https://www.inaturalist.org/observations/61732504).

However, what also requires description and explanation is a conspicuous pattern on the forequarters, which is most noticeable in profile and in a posture in which the inner foreleg is exposed.

The feature in question is complex, consisting of

In having a conspicuously pale inner surface, the foreleg differs from the hindleg (https://www.inaturalist.org/observations/36167595).

In this and other ways, the pattern makes little sense in terms of countershading (https://en.wikipedia.org/wiki/Countershading).

https://www.inaturalist.org/observations/101206028 and https://www.inaturalist.org/observations/101171620

https://www.inaturalist.org/observations/97075871

https://www.inaturalist.org/observations/75142350

https://www.inaturalist.org/observations/69512342

https://www.inaturalist.org/observations/68901309

https://www.inaturalist.org/observations/54358694

https://www.inaturalist.org/observations/52417150

https://www.inaturalist.org/observations/51659800

https://www.inaturalist.org/observations/16922321

https://www.inaturalist.org/observations/10708031

https://www.inaturalist.org/observations/4126822

https://www.inaturalist.org/observations/3213126

https://www.inaturalist.org/observations/205313614 and https://www.inaturalist.org/observations/205313616 and https://www.inaturalist.org/observations/205313613

Publicado el abril 7, 2024 09:26 TARDE por milewski milewski

Comentarios

The following shows that, in Odocoileus hemionus hemionus in summer pelage, the ischiocaudal feature is not conspicuous enough to qualify as a bleeze:

https://www.inaturalist.org/observations/70688799

Publicado por milewski hace 3 meses

Shift to beneficially bloodshot

https://www.inaturalist.org/observations/70023253

Publicado por milewski hace 3 meses

@beartracker

In Odocoileus hemionus hemionus in winter pelage, there is a posterior auricular semet (https://www.inaturalist.org/observations/66559529 and https://www.inaturalist.org/observations/112210692 and https://www.inaturalist.org/observations/140271223).

As in several other clades of Cervidae, this feature disappears in adult males (https://www.inaturalist.org/observations/101953811).

Publicado por milewski hace 3 meses
Publicado por milewski hace 3 meses

Odocoileus hemionus hemionus in summer pelage:

The following show the ischiocaudal colouration. What is a bleeze of the winter pelage no longer qualifies as a bleeze in summer pelage.

The disqualification is partly owing to the thinning of the pelage around the perineum, exposing the skin.

https://www.inaturalist.org/observations/29211428

https://www.inaturalist.org/observations/21529733

https://www.inaturalist.org/observations/14120179

Publicado por milewski hace 3 meses
Publicado por milewski hace 3 meses

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