Zebra Finch gender identification

[nicamsgb]

Hi, I have 4 zebra finches in a small aviary. I originally had 1 pair of chestnut flanked white zebras which are currently feeding 2 babies and sitting on a third egg. Three days ago, I acquired a female who is all white and another one that I am having difficulty determining its sex and mutation.

At first I believed it was a female but the beak is very red compared to the other females. It also has a slight grey area on the cheeks but it does not seem like the males patches. I have not heard it sing to the other females, but I've only had the last 2 for three days now.

I have attached pictures, let me know what you think.

[rainefeather19128]

if the beak is red it is male without a doubt. are there any chestnut flanks or black stripes on the throat?

[nicamsgb]

it is such a hard bird to identify. It has no bars or flanks just a smooth beige/grey color on the chest that runs down to the stomach area. The beak is orangey-red. Not as red as the male though but it does seem red.

[rainefeather19128]

i'm not sure but i bet it is male....i could be wrong though.i'd wait and see if it sings.