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Anvil stone, where a thrush has broken open shells of polymorphic Cepaea snails; its selection of morphs may be frequency-dependent.
Anvil stone, where a thrush has broken open shells of polymorphic Cepaea snails; its selection of morphs may be frequency-dependent.
Harmless scarlet kingsnake mimics the coral snake, but its pattern varies less where the coral snake is rare.
Harmless scarlet kingsnake mimics the coral snake, but its pattern varies less where the coral snake is rare.
Venomous coral snake's warning coloration can benefit harmless mimics, depending on their relative frequency.
Venomous coral snake's warning coloration can benefit harmless mimics, depending on their relative frequency.
Müllerian mimetic species of Heliconius from South America
Müllerian mimetic species of Heliconius from South America
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Herbert Spencer
Herbert Spencer
Image: Selective sweep, frequency vs time
Image: Selective sweep, frequency vs time