The association with ants is believed to reduce the parasitisation of the butterfly caterpillars.
2.
Parasitisation of nestlings by " Protocalliphora " blow-fly larvae is a significant factor in nestling mortality.
3.
The southern masked weaver lays eggs of a various colour and this helps it to evade parasitisation by cuckoos because the cuckoo has no way of knowing what kind of eggs are inside the weaver's nest until it has entered the nest to attempt to lay one itself.
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