Those are the families. The species are in black and belong to the family assigned above them. For example, the Black-bellied Whistling-Duckon the birds list, why are some of the birdnames in orange?
(sorry if this is an obvious question)
So, yes I think you could write on them. I mean they wouldn't really serve another purpose if it wasn't organized, right?It says it can be tabbed, so I would presume that's what it means.
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