If ingested by the bird, the seed will pass through undigested and emerge still coated with its sticky outer covering. If the mistletoe is very lucky, the unctuous mass will land on the branch of a host tree.
Alternately: a bird finishes his messy snack, and stops to strop his sticky beak across a branch, leaving the seeds pasted in place.
Either way, there the seed begins its business, anchoring itself to its new host, over time forming a graft like the one pictured below.
This particular mistletoe's leaf greatly resembles the gum (eucalypt) tree it was residing in. We might have let it be, except that it had grown low enough to block the view of traffic when exiting our driveway, so... bummer.
Although Im sure the gum tree doesnt mind.
I want to make a joke about how mistletoe can be like depression, something along the lines of:
Obviously the joke needs more work, still, Im sure you get my point. Be good to yourselves till next post!