Mammals in Which Females are Larger Than Males
@article{Ralls1976MammalsIW, title={Mammals in Which Females are Larger Than Males}, author={Katherine Ralls}, journal={The Quarterly Review of Biology}, year={1976}, volume={51}, pages={245 - 276} }
Females are larger than males in more species of mammals than is generally supposed. A provisional list of the mammalian cases is provided. The phenomenon is not correlated with an unusually large degree of male parental investment, polyandry, greater aggressiveness in females than in males, greater development of weapons in females, female dominance, or matriarchy. The phenomenon may have evolved in a variety of ways, but it is rarely, if ever, the result of sexual selection acting upon the…
628 Citations
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References
SHOWING 1-10 OF 185 REFERENCES
The Ecological Significance of Sexual Dimorphism in Size in the Lizard Anolis conspersus
- Environmental Science, BiologyScience
- 1967
Anolis conspersus selects prey from a wide range of taxa and shows no obvious intraspecific specialization not connected to differences in microhabitat and prey size.
Size Dimorphism and Food Habits of North American Owls
- Biology
- 1970
It is believed that the increased size of the female over the male permits differential niche utilization by the sexes; that is, a difference in sizes of the sexes would allow differential niche utilized by the genders.
The Relationships between Mammalian Young and Conspecifics other than Mothers and Peers: A Review
- Psychology
- 1971
Evolution of Polyandry in Birds
- Biology
- 1974
Comparisons of the existing polyandrous systems suggest that they can be arranged in a sequence that leads through a series of relatively minor differences from monogamy to simultaneous polyandry.
OCCURRENCE OF SUCCESSFUL MULTIPLE INSEMINATION OF FEMALES IN NATURAL POPULATIONS OF DEER MICE (PEROMYSCUS MANICULATUS)
- BiologyEvolution; international journal of organic evolution
- 1973
This paper is a report of direct evidence of frequent multiple male parentage within single litters in natural populations of deer mice (Peromyscus maniculatus), suggesting that in these populations the social units must be large enough to include two, or probably more, breeding males.
SEXUAL DIMORPHISM IN SKATES (RAJIDAE) AND ITS POSSIBLE ROLE IN DIFFERENTIAL NICHE UTILIZATION
- BiologyEvolution; international journal of organic evolution
- 1974
The purpose of this paper is to consider the possibility that the strongly dimorphic feeding apparatus in many skates represents another example of differential niche utilization by the sexes.
Social Organization in Two Species of Costa Rican Heteromyid Rodents
- Environmental Science, Biology
- 1974
The social organization of two species of Costa Rican heteromyid rodents, Liomys salvini and Heteromys desmarestianus, was investigated using both laboratory and field techniques and it is suggested that behavioral interactions are important in population regulation in both species.
A Quantitative Study of Foraging of Male and Female Spruce‐Woods Warblers
- Environmental Science
- 1968
Males of four congeneric species of wood warblers inhabiting a spruce forest of coastal Maine were found to forage higher than their females, and the partitioning of sexes results in a situation where males can foraging readily while remaining maximally conspicuous, and females can forage in an area maximally adjacent to their nests.
Some sexual differences in behaviour within a colony of marked beavers (Castor canadensis)
- Environmental Science
- 1973
Measurements, composition and behaviour of a large colony of the bat Pipistrellus pipistrellus
- Biology
- 1968
A study in Dorset, England, of a very large nursing colony of the common bat Pipistrellus pipistrellus provided some much needed basic taxonomic data for this species in the British Isles. Despite…