What species of finch is this baby please? It and its sibling were tossed from the nest - one is dead and this one is on its way unfortunately. I think I know, but want to be certain which nest they came from.
I have Zebras, yes, but no Cutthroats. I don't recognise these as Zebs though. I've not seen such dark grey skin on baby Zebs before, and these just look different to my eye. Also Zebs don't usually toss babies.
I also have RFPFs, TRPFs, RC Cordons and Orangebreasts. (Gouldians too, but it's def. not a Gouldian.)
Zeb it is then. Heavy down. PF have no down. Cordons have fawn down & OBs are tiny. May be a charcoal/black-bodied variety with darker than usual skin or just a normal which are reasonably dark-skinned. If you've left independent young in there they are likely suspects.