How did my shrub have a baby?

[ZandraJoi]

There's a only, very high maple shrub infront of my home. A very extensive period ago it ''gave birth'' to a child maple shrub (which is now about 3 legs tall), about 5 metres away from it.

How did that happen?

Did this happen again to your maple shrub or to any other plants in your area?
Many factors can contribute to something like this.