Presentació = Presentation Autors/ores Josep Vigo i Bonada Descàrregues Text complet Publicat 2010-06-21 Número 5-2 Secció Celebration of the Darwin Year 2009 Llicència This work, including photographs and other illustrations, unless the contrary is indicated, is subject to an Attributions–Non-Commercial–No Derivative Works 3.0 Creative Commons License, the full text of which can be consulted at http://creativecommons.org/licenses/by-nc-sa/3.0/. You are free to share, copy, distribute and transmit the work provided that the author is credited and reuse of the material is restricted to non-commercial purposes only and that no derivative works are created from the original material.