The color of the male's bill is black during breeding season; by contrast, during non-breeding season, the male's bill is horn in color, as is the female's horn.
During non-breeding season, the male's bill is horn, as is the female's horn. The color of the male's bill is black during breeding season.
The color of the male's bill is black during breeding season. During non-breeding season, the male's bill is horn, as is the female's horn.
The color of the male's bill is black during breeding season. During non-breeding season, the male's bill is horn, as is the female's horn.