1>They having sexual dimorphism.
2>Male bird having a glistening metallic black all over the body.
3>The bird having meladious voice.
4>Koel having nest parasite.
5>The male is better known by its meladious voice.
2>Male bird having a glistening metallic black all over the body.
3>The bird having meladious voice.
4>Koel having nest parasite.
