Well, you've seen my post on Vanya - a white headed babbler's adventures. After a babbler, now its time for a Koel.

Infact, the young koels even have a sound similar to that of crow. Once the koel is considerably older, its original voice, comes out. Only then the crow realizes that the little one is not its own and pushes it out of the nest.
When born both male and female look similar like that of a crow. As the female grows, its voice changes, becomes brownish, develops spots all over it, and gets crimson colored eyes. As the male grows, its voice changes too, but becomes shiny, pitch black, and gets crimson colored eyes as well! The female koel is the first to get identified coz it starts developed spots all over it and becomes brownish in color, though its also black when born. The male koel doesn't get identified till its voice changes.

I spotted the female koel as soon as it was pushed out of its nest. The spots had just started to develop, so the crow has found about this. Its eye color has still hasn't changed to crimson. At this point, this little one did not even understand why its 'mom' that was loving, caring and feeding till previous day!!!
I tried to feed it some fruit of curry leaves plant - a delicacy for koels! But it didn't know how to eat by itself. It didn't know to fly properly as well! Sadly it tried to climb the neem tree once again, where its nest was located. It kept calling out for the 'mom'. But the crow and few more fellow crow friends of the mother, kept pushing it and attacking it! It was so much attacked that it got bruised near it eyes!!! All I could do was to scare away the crows, so atleast the koel is not killed!!!
In some time the young one realized that its 'mom' is no longer loving it and it had to fend for itself. It hid within the mango tree's branches and foliage and stopped calling for its 'mom'. Hoping that it'll learn to live by itself, I left it there!!!