Noisy miners

I’m doing a presentation on behalf of BirdLife Melbourne to a local parklands group later in the year and am currently working on it, so that I can get appropriate photos to use hopefully (which can take time.) I’m using birds I’ve seen when I’ve visited the park and am up to Noisy Miners. I’m mentioning that both they can be quite pugnacious, driving other birds ranging from pardalotes to cormorants in size, out of their territories.

Sometimes it seems they they work in groups too. Does anyone have any thoughts about whether this is co-operative or just every bird for itself?

Thanks for any thoughts in advance. ===============================

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