It can be difficult to distinguish between original kill sign and scavenging sign. Here is an example.
Predated Paradise Duck Nest
A swamp harrier was seen flying up from the area of a paradise duck nest, where the remains of eggs were found. There is no knowing whether or not the harrier was the original predator or whether it was scavenging existing remains. The swamp harrier is a bird of prey native to New Zealand that also scavenges carrion.
Pictured are the remains of the two eggs found and the new hole at the top of the nest.
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