Extra-pair copulation occurs in:
Monogamous species reflects key principle in quiz on territory behaviour+pyqs, where evolutionary mechanisms shape genetic variation and adaptation. In this context, Monogamous species aligns with experimental and theoretical evidence from population genetics, behavioral ecology and molecular phylogeny. Textbooks like Campbell Biology, Futuyma Evolution and Hartl Principles illustrate supporting data. Understanding why Monogamous species fits helps integrate natural selection, environment.
Ref: Krebs & Davies, Behavioural Ecology, Chapter 5: Territoriality.