Why do some currawongs have striped tails?

Every year around January or February, someone usually asks me about a strange currawong they saw with a striped tail. If you’re familiar with currawongs you’ll know they don’t normally have stripes or spots down the tail, in the way that cuckoos and kookaburras do. So what’s the story with the ones that appear in summer, tail all stripy like the bird in the photo below? The explanation is quite simple.

Pied Currawong with striped tail due to moult

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