Grandalas are a species of bird that is native to the Himalayas, and they are known for their striking coloration and deep sexual dimorphism. In fact, the difference between male and female grandalas is so distinct that it’s hard to believe they belong to the same species.

While female grandalas are predominantly brown with white streaks all over their head, males are almost eye-searing blue, with a vibrant shade that is hard to miss. This difference in coloration between the sexes is a prime example of sexual dimorphism, which refers to the physical differences between males and females of the same species.

The reasons behind sexual dimorphism in grandalas are not yet fully understood, but it is believed to be related to their mating habits. Male grandalas use their bright blue plumage to attract females during the breeding season, and the more vibrant their coloration, the more likely they are to be chosen as a mate.

Despite their stunning coloration, grandalas are not very well known outside of their native habitat. These birds inhabit high-altitude forests in the Himalayas and are known for their elusive nature. They are also highly territorial and can be aggressive towards other birds that venture into their territory.

This picture captured by Rajesh Panwar in North Sikkim, India, gives a nice visualization of the deep sexual dimorphism in grandalas. The male grandala’s bright blue plumage is almost electric against the brown and green background, making it hard to miss even from a distance.

In conclusion, grandalas are a fascinating species of bird that are known for their striking coloration and deep sexual dimorphism. While female grandalas are predominantly brown with white streaks, males are almost eye-searing blue, making them a prime example of sexual dimorphism in the animal kingdom. Despite their stunning appearance, grandalas remain relatively unknown outside of their native habitat, where they inhabit high-altitude forests in the Himalayas.