Because little is known about Irrawaddies, until recently biologists were unsure where they fit on the whale - dolphin family tree. Obviously, they have much in common with dolphins.
क्योंकि इरावाडियों के बारे में बहुत कम ज्ञान है, इसलिए हाल ही के समय तक जीवविज्ञानी निश्‍चित नहीं थे कि ह्वेल - डॉलफिन वंशावली में ये कहाँ फिट होती हैं ।