Human-mediated dispersal and natural colonisation: are they that different? A Stonehenge and B a rocky shore were both created by rolling stones, but they are quite different in origin and these differences are important. A is courtesy of Diego Delso, under the CC BY-SA 4.0 licence, https://commons.wikimedia.org/w/index.php?curid=35323153); B is courtesy of Tim Blackburn.

 
 
  Part of: Wilson JRU, García-Díaz P, Cassey P, Richardson DM, Pyšek P, Blackburn TM (2016) Biological invasions and natural colonisations are different – the need for invasion science. NeoBiota 31: 87-98. https://doi.org/10.3897/neobiota.31.9185