Sexual dimorphism wolf

Federal government websites often end in. Before sharing sensitive information, make sure you're on a federal government site. The site is secure. An official website of the United States government Here's how you know. Body size and predatory performance in wolves: Is bigger better?
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Sexual dimorphism

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ADW: Canis lupus: INFORMATION

Sexual dimorphism is the condition where the two sexes of the same species exhibit different characteristics beyond the differences in their sexual organs. The condition occurs in many animals and some plants. Differences may include secondary sex characteristics , size, weight, colour, markings, and may also include behavioral and cognitive differences. These differences may be subtle or exaggerated, and may be subjected to sexual selection. The opposite of dimorphism is monomorphism.

Canadian Journal of Zoology

Twenty-two skeletal, visceral, and adipose parameters were compared in wolves collected from the central Arctic between and Fifteen parameters differed significantly by sex. Males were usually larger than females; however, the degree of sexual dimorphism varied with structure. Patterns of adipose deposition were also significantly different.
Aggression directed at conspecific groups is common among gregarious, territorial species, and for some species such as gray wolves Canis lupus intraspecific strife is the leading cause of natural mortality. Each individual in a group likely has different measures of the costs and benefits associated with a group task, such as an aggressive attack on another group, which can alter motivation and behavior. Overall, all wolves were more likely to chase rivals if they outnumbered their opponent, suggesting packs accurately assess their opponent's size during encounters and individuals adjust their behavior based on relative pack size. Males were more likely than females to chase rival packs and gray-colored wolves were more aggressive than black-colored wolves. Male wolves and gray-colored wolves also recorded higher cortisol levels than females and black-colored wolves, indicating hormonal support for more intense aggressive behavior.
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