Brassica Park

The final book in the Planet Dweller series.

The Earth is no longer fit for humans,
the Planet Dweller is no longer one entity,
and humankind are now dinosaurs.
Which is what would be expected after the meddling of two superbeings who never quite got the hang of mortality, although secretly aspiring to it.
And there is also this dodo, and an intergalactic criminal in a pretty frock.