[Cerium]

I suppose the mangroves walk as much as a glider in Conway's game of life glides.

[glenstein]

I was having brain freeze trying to understand what exactly was meant, but this is a brilliant way of putting it.

[djmips]

But not even that much I don't think. But perhaps you are thinking along the lines of a whole forest moving. Trees dying on one side, born on the other. Over a long timescale the forest 'walks'.

[Cerium]

How is that different than a horizontal tree growing on one end and rotting on the other?