Help with ID please

[Lindell <>]

Firstly I apologise if this attachment is too big - I don't want to decimate the details too much. 

These two birds flew across near the bridge at the wetlands in hot pursuit of a wattlebird towards Fyshwick this morning. I didn't get the bins on them but did notice they weren't flying like Wattlebirds. I followed and they had stopped on this dead tree way across the creek. This is the best my lens would do.

Would I be right in saying that they were dependent juvenile Fantail Cuckoos with the parent Wattlebird?

If wrong can someone tell me what they might be please.

Thank you

--

Lindell

Griffith ACT

Attachment:

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