In this audio clip you can listen to the sweet song of the koel. The clip begins with the melodious call of the koel. However later, roughly around one and half minutes, the koel is heard in an enticing interaction with the crow ! 


The Asian Koel is known to be a « brood-parasite ». (For some reason I have difficulty in associating such a term for a bird as sweet as the koel.)


This bird behaviour is exhibited by many cuckoos, including koels, where they lay eggs in the nest of a host-bird. 
In case of the koel, it’s the crow who is the fall guy. The koel scrupulously watches the nest of the crow till the moment it’s left unguarded. Taking advantage of the absent crow, the mama koel conveniently lays her eggs in this nest along-side the crow’s eggs. The gullible crow incubates, hatches, raises providing nourishment and security to the koel as one of her own.

Parasites, like thoughts, cannot exist without a compliant host. So, thanks to the crow, our planet is blessed with a good population of sweet singing birds.

Vibha GK