[Nerwen]

Thank you Marhwini, but I specifically referred to "brood parasitism" by name in my previous post. Therefore it should be clear that I know what it is. [And the very article you link uses the specific terms "parasite" and "host", as do all the more technical articles I have read, so I'm not sure what the quibble is over.]

Moving on.

Isn't this all pure conjecture and assumption on your part? You have no actual data, right?