In animal behavior, resource defense polygyny is a mating strategy where a male is able to support multiple female mates by competing with other males for access to a resource.
Males capable of maintaining a larger territory are said to have greater resource holding power.
[3] Resource defense polygyny is a common strategy in insects.
For examples, damselflies in the family Calopterygidae typically display resource defense polygyny, in which territorial males guard riverine habitat that is sought after by females for egg deposition.
The yellow headed blackbird is an example, where a male may have multiple females nesting in his territory.