M & F
Black-bellied sandgrouse have a quite visible sexual dimorphism, meaning that females and males differ in some of their visible physical properties. The picture shows this quite well - most obviously, the male (on the left in the picture) has a clearly visible breastband, with good contrast to neck and belly feathers, females (like the one on the right) have a spotted neck up to the breast.
M & F
Black-bellied sandgrouse have a quite visible sexual dimorphism, meaning that females and males differ in some of their visible physical properties. The picture shows this quite well - most obviously, the male (on the left in the picture) has a clearly visible breastband, with good contrast to neck and belly feathers, females (like the one on the right) have a spotted neck up to the breast.