Nicobar pigeon (Caloenas nicobarica)

That is a very beautiful image of a Nicobar.

I must check my own images to see if they to have painted toenails, as I have seen Nicobars all over the place but never noticed this before.

If they are 'normal' Nicobars, they should have painted toenails, because this is the normal color of toenails in this species

I'm sure they are normal but as the ones I have seen have usually been on the ground in foliage their toenails have probably been out of sight.