Good afternoon from Kenya,

I am writing about avian brood parasites.  My questions are these.

1 Once a female has copulated, how many fertilised eggs will follow from that copulation?  If a cuckoo lays say 20 eggs over the course of 40 days, how often need she have mated?

2 Do birds have an urge to lay an egg which evenually cannot be controlled?  So does there come a time when she has to put the egg somewhere?  I ask this in the context of "egg dumping" when an egg appears to be laid in a nest of a different species, in which it is unlikely to survive to maturity?

Sorry but no-one seems to know the answer to your question.