Male impala form small bachelor herds during both the wet and dry seasons. These bachelor herds are generally smaller than herds of females, numbering around 4 members, compared to upwards of 10. Juvenile males begin to join bachelor herds at 8 months of age. In the Serengeti, immature or older males will usually form their own bachelor herds, while males of reproductive age are more often in mixed groups with females.
Info source URL: https://en.wikipedia.org/wiki/Bachelor_herd#Impala
The photo was taken during 2018-08 at Segaia Bush Retreat, Buffelsdrift, Gauteng, South Africa.