A new feature of adaptive colouration in ungulates: the fibular flag, part 2: Alces alces (Cervidae)

...continued from https://www.inaturalist.org/journal/milewski/70368-a-new-feature-of-adaptive-colouration-in-ungulates-the-fibular-flag-part-1-raphicerus-bovidae#

The moose (Alces alces, https://www.inaturalist.org/taxa/522193-Alces-alces) possesses a fibular flag (https://www.gettyimages.com.au/detail/photo/bull-moose-moving-through-northern-tundra-calling-royalty-free-image/657485842).

In this large-bodied cervid, the fibular flag covers the inner, and often also the outer, surfaces of the hindleg above the hock.

https://www.inaturalist.org/observations/107522426

The fibular flag of the moose is individually and seasonally variable, and also depends on illumination.

In the summer pelage, the fibular flag is poorly-developed (https://www.inaturalist.org/observations/179584604 and https://www.inaturalist.org/observations/170204579 and https://www.inaturalist.org/observations/79012704 and https://www.inaturalist.org/observations/31202401).

The following illustrate the fibular fag in Alces alces shirasi:
https://www.inaturalist.org/observations/22730337
https://www.inaturalist.org/observations/165808747
second photo in https://www.inaturalist.org/observations/183755724
https://www.inaturalist.org/observations/73121671
https://www.inaturalist.org/observations/4482611
https://www.inaturalist.org/observations/4308293

Fibular flag in Alces alces alces:
https://www.inaturalist.org/observations/35274716
https://www.inaturalist.org/observations/183855765
https://www.inaturalist.org/observations/183819576
https://www.inaturalist.org/observations/153934473
https://www.inaturalist.org/observations/46595843
https://www.inaturalist.org/observations/2922305

In nominate A. a. alces, the pale feature in question can be so expansive that the term 'fibular flag' no longer applies (https://www.inaturalist.org/observations/112176729).

ADDITIONAL ILLUSTRATIONS OF FIBULAR FLAG IN ALCES ALCES

https://www.inaturalist.org/observations/116777704

https://www.inaturalist.org/observations/115702446

https://www.inaturalist.org/observations/115325363

https://www.inaturalist.org/observations/115314501

https://www.inaturalist.org/observations/114790758

https://www.inaturalist.org/observations/112619055

https://www.inaturalist.org/observations/135414451

https://www.inaturalist.org/observations/115470987

https://www.inaturalist.org/observations/125843310

https://www.inaturalist.org/observations/121343112

https://www.inaturalist.org/observations/120257251

https://www.inaturalist.org/observations/129646111

https://www.inaturalist.org/observations/119626107

https://www.inaturalist.org/observations/119092478

https://www.inaturalist.org/observations/116521066

https://www.inaturalist.org/observations/134851345

https://www.inaturalist.org/observations/116789745

https://www.alamy.com/stock-photo-moose-from-behind-142718462.html

https://www.inaturalist.org/observations/131879614

https://www.inaturalist.org/observations/126552983

https://www.inaturalist.org/observations/125993345

Why A. alces is unusual, in possessing a fibular flag, is worthy of further investigation.

Posted on Σεπτέμβριος 18, 2023 1008 ΠΜ by milewski milewski

Σχόλια

The following of Alces alces americanus shows that some individuals, in some circumstances, do not show any fibular flag. This is despite the presence of a pedal flag on the foreleg.

https://www.inaturalist.org/observations/176492198

Αναρτήθηκε από milewski 5 μήνες πριν

The following shows that the fibular flag appears at the juvenile stage in Alces alces alces:

https://www.inaturalist.org/observations/171011163

Αναρτήθηκε από milewski 5 μήνες πριν
Αναρτήθηκε από milewski 5 μήνες πριν
Αναρτήθηκε από milewski 5 μήνες πριν
Αναρτήθηκε από milewski 5 μήνες πριν
Αναρτήθηκε από milewski 5 μήνες πριν
Αναρτήθηκε από milewski 4 μήνες πριν

Shift

Clear illustration of semi cross-walk:

https://www.inaturalist.org/observations/133255783

Αναρτήθηκε από milewski 4 μήνες πριν
Αναρτήθηκε από milewski 4 μήνες πριν

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