Which Bird does not make a nest?

The guy is on his final question for 5 crore on ‘Who Will be a Billionaire’, and has one lifeline left, ‘Phone A Friend’, and the Question was

“Which Bird does not make a nest?”

1: Sparrow
2: Swallow
3: Blackbird
4: Cuckoo

The guy is not sure, so he calls his girlfriend.

She answers, “Stupid, it’s obviously a cuckoo, 100%” and the guy wins.

Later the guy calls his girlfriend, “how the hell did you know that, honey?”

I must say you’ve got more brains than i credit you for!” And the sweet thing replies:

“Well, u idiot, a cuckoo lives in a clock na!”

“The guy faints”!!!