"A bird （mentioned in the Amitabha Sutra） whose singing is very melodious and which is first heard while still in the shell."
"The Indian cuckoo， a bird of fairyland， whose sweet songs charm all the inhabitants of the forest."
"A kalavinka bird is a bird described as having a melodious voice， and is found in the valleys of the Himalayas. It is said to sing in the shell before hatching."