Capitalisation in hyphenated names

["Peter Shute" <>]

While we're discussing the origins of Jacana, and I'm stuck in a hotel room in 
Manly because it's raining, here's another name related question.

How come some hyphenated bird names get a capital letter for the second part of 
the name, but some don't?  It seems to be consistent in the field guides.

E.g. Turtle-Dove, Cuckoo-Dove, King-Parrot, Bee-eater, Button-quail, 
Fairy-wren, Native-hen.

Is there some rule about this?

Peter Shute

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