If a redbird has red babies, and a bluebird has blue babies, what kind of bird has no babies?

A Swallow.

Urologist told me a joke during my vasectomy...

So during my vasectomy it was just me and the younger female doctor in the room. She was talking with me to distract me and said you want to hear a good vasectomy joke? Of course I said yes, not knowing it was going to go this way.

If a Bluebird has blue babies, a blackbird has black babies...

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