Editing Helpers at the nest (section)

== Examples ==
It occurs in between three and eight percent of bird [[species]] worldwide (estimates vary), but is much more common in [[Australia]] and [[Southern Africa]].<ref>{{cite journal|author1=Jetz, Walter|author2=Rubenstein, Dustin R.|year=2011|title=Environmental Uncertainty and the Global Biogeography of Cooperative Breeding in Birds|url=https://www.researchgate.net/publication/49708773|journal=Current Biology|volume=21|issue=1|pages=72–78|doi=10.1016/j.cub.2010.11.075|pmid=21185192|doi-access=free|bibcode=2011CBio...21...72J }}</ref><ref>McMahon T.A. and Finlayson, B. (1992) ''Global Runoff: Continental Comparisons of Annual Flows and Peak Discharges'', Catena Verlag, {{ISBN|3-923381-27-1}}</ref> Bird species in which this behaviour is found include the [[common moorhen]], the [[house sparrow]], the [[acorn woodpecker]],<ref>{{Cite journal|last1=Koenig|first1=Walter D.|last2=Walters|first2=Eric L.|date=2012-01-01|title=Brooding, provisioning, and compensatory care in the cooperatively breeding acorn woodpecker|journal=Behavioral Ecology|language=en|volume=23|issue=1|pages=181–190|doi=10.1093/beheco/arr172|issn=1465-7279|doi-access=free}}</ref> and the [[apostlebird]]. [[Humans]], [[damaraland mole-rat|damarland mole rats]] and [[Meerkat|meerkats]] are examples of mammals that exhibit this behaviour.<ref name=":0" /> It is also seen in a number of species of bee such as [[carpenter bee]]s (note this is distinct from the behaviour of the [[European honey bee]], where the worker bees are sterile and incapable of reproducing).