ID birds sex | Orange-necked partridge (1 Viewer)

[vupham]

Hi,
Is there anybody know which sex these birds are ?

https://imgur.com/a/5jTLvaE

I mark what I am guessing in the image a family of group 4, with most of the time the male seems standing erect most while other chicks and female (have color older, brown ... ) but I maybe wrong, hope can get some help from here

Thank you

 

[Butty]

Can you give the location and date, please? Thanks.
I can't see any clear differences between the birds. I think you may be confused by the effect of shade.

 

[vupham]

Can you give the location and date, please? Thanks.
I can't see any clear differences between the birds. I think you may be confused by the effect of shade.

Yeah here is
Date: Dec 28, 2022
Location: Thac Mai, Gia Canh, Dinh Quan, Dong Nai province, Vietnam (google map link: Thác Mai · Gia Canh, Định Quán District, Dong Nai, Vietnam)

Here is the video: