Mating System Types

Polyandry

Mating system where one female mates with multiple males, relatively rare in the animal kingdom
25 Animals
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Overview

Understanding This Category

Polyandry is a mating system in which a single female mates with multiple males within the same breeding period or reproductive bout. The males may fertilize different clutches/eggs or contribute to the same brood, depending on the species.

Polyandry is when a female has more than one mate in a breeding season, one after another or at the same time. It ranges from classical polyandry (female keeps several males and lays separate clutches) to genetic polyandry (many males father young in one clutch). Females may gain more care, nests, or better genes. In some species, like shorebirds, males do most care so females can mate again.

Etymology: "From Greek roots meaning "many" + "man/male," literally "many males.""

Key Characteristics

One female mates with more than one male within a breeding period
Often increases multiple paternity and within-brood genetic diversity
Can involve role-reversed sexual selection (males provide more care; females compete for mates) in some species
Frequently associated with sperm competition and cryptic female choice
May be sequential (female switches mates) or simultaneous (female maintains multiple mates)
Parental care may be male-biased, shared, or minimal depending on ecology and taxa
Examples

Animal Examples

Iconic Examples

Red-necked phalarope Classic sex-role-reversed polyandry: females mate with multiple males, while each male typically incubates and cares for a clutch.
Spotted sandpiper Well-known shorebird where females commonly maintain territories and mate with multiple males in a season.
Northern jacana Iconic example of polyandry with strong female territoriality and multiple male "harem" mates.
Dunnock (hedge sparrow) A well-studied passerine showing polyandry and mixed systems (including polyandry and polygynandry) within populations.
Western honey bee Queen is strongly polyandrous: she mates with many males during a brief mating period and uses stored sperm for years.

Surprising Examples

Common garter snake
Rough-skinned newt
Broad-nosed pipefish

Extreme Examples

Western honey bee (queen)
Leafcutter ant (queen)
Spotted sandpiper

Found across: Birds-especially shorebirds (phalaropes, sandpipers) and jacanas; also some passerines (e.g., dunnocks), Insects-particularly Hymenoptera (bees, ants, wasps) where queens often mate multiply, Fish-especially sex-role-reversed groups like pipefishes and seahorses (Syngnathidae), Reptiles-snakes and some lizards frequently show multiple mating and multiple paternity, Amphibians-salamanders and some frogs with frequent multiple paternity, Mammals-present as genetic polyandry in some rodents, bats, and primates, though less often as stable "one female-multiple male" social units

Fun Facts

Did You Know?

Polyandry can flip the usual "sex roles": in many polyandrous species, females compete for access to males, while males become choosy because their parental investment is high (e.g., many shorebirds).

In some polyandrous systems, a female's eggs end up split across multiple "dad-nests," spreading risk-if one nest fails, others may still succeed (a kind of biological insurance policy).

Polyandry can make sperm, not bodies, the main battleground: when multiple males mate with the same female, selection often favors traits that boost sperm success (more sperm, faster sperm, or better sperm competition strategies).

It can reduce the cost of parenting for a female in certain species: when males take on incubation and chick care, a female can lay another clutch and increase her total reproductive output.

Polyandry isn't just about "more mates": in many species it's a strategic response to ecology-short breeding seasons, high predation, or scarce resources can favor mating with multiple males to maximize offspring survival.

Polyandry Animals

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