Answers are grounded in this paper and cite their sources.
Bart Kempenaers, Rianne Pinxten, Marcel Eens, Intraspecific Brood Parasitism in Two Tit Parus species: Occurrence and Responses to Experimental Parasitism, Journal of Avian Biology, Vol. 26, No. 2 (Jun., 1995), pp. 114-120
No takes yet. Share an insight, caveat, or question.
Kempenaers et al. (1995) studied this question.
Synapse has enriched 10 related papers. Consider them for comparative context: