Mr Red may be stretching it but not so far as to make the stork/stalk link completely off the wall. There are I think etymological connections between the words "stalk" and "stork" - the bird walks with long strides as somebody does when he stalks. The noun "stalk" has phallic connotations and may have been once used as slang for "penis" . A bit of a punning joke between adults when asked the question "where did I come from"? It's not impossible.