Beauty around me

It is 9.30 am.  I was sitting out on my verandah when I saw a pale coloured bird fly into the divi-divi tree near me and two crows coming after it.  Minutes later a tree pie flew there too.    When I looked carefully, I realised the pale bird was a female Indian cuckoo--the koel.  So naturally the crows were chasing it.  But I couldn't quite see what the tree pie had to do there.  Soon the tree pie flew off screaming.  A little later the koel flew off and the crows sat there very triumphantly.