Species variation
Species variation
Brassica oleracea

Visual comparison of Brassicas

Zea mays, Teosinte compared to modern corn

Polymorphic mimicry - see also, more - at wikipedia
In contrast to the plant variation this variation arises through natural selection
On Batesian mimicry, Polyphenism at wikipedia

Phenotypic plasticity at wikipedia

Population genetic structure of the giraffe, phylogeny