Species variation
Species variationBrassica oleracea
Visual comparison of Brassicas
Zea mays, Teosinte compared to modern corn
Polymorphic mimicry - see also, more - at wikipediaIn contrast to the plant variation this variation arises through natural selectionOn Batesian mimicry, Polyphenism at wikipedia
Phenotypic plasticity at wikipedia
Population genetic structure of the giraffe, phylogeny