Fraction of species that are interspecific and intraspecific brood parasites (out of the ~10,000 bird species)

Range interspecific 1%: intraspecific 2% %
Organism Birds
Reference Stevens M. Bird brood parasitism. Curr Biol. 2013 Oct 21 23(20):R909-13. doi: 10.1016/j.cub.2013.08.025 abstractPubMed ID24156805
Comments Abstract: "Perhaps for this reason [that for many animals, the effort to rear their young is considerable], about 1% of birds (around 100 species) save themselves the effort and cheat instead... Some birds also cheat on individuals of the same species (intraspecific brood parasitism). Intraspecific brood parasitism has been reported in around 200 species, but is likely to be higher, as it can often only be detected by genetic analyses."
Entered by Uri M
ID 117200