bluebird

Short definition from Wiktionary

Noun

1. 1
   Any of various North American birds of the genus Sialia in the thrush family. Their plumage is blue or blue and red.
2. 2
   Any of various African starlings of the genus Lamprotornis, family Sturnidae, having predominantly glossy blue plumage.
3. 3
   An unexpectedly profitable or large deal that comes to a salesperson with minimal effort.
4. 4
   Someone connected with Cardiff City Football Club, as a fan, player, coach etc.