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African pygmy kingfisher, showing coloration shared by all adults of that species to a high degree of fidelity.
African pygmy kingfisher, showing coloration shared by all adults of that species to a high degree of fidelity.
Cichlids such as Haplochromis nyererei diversified by sympatric speciation in the Rift Valley lakes.
Cichlids such as Haplochromis nyererei diversified by sympatric speciation in the Rift Valley lakes.
Rhagoletis pomonella, the hawthorn fly, appears to be in the process of sympatric speciation.
Rhagoletis pomonella, the hawthorn fly, appears to be in the process of sympatric speciation.
Gaur (Indian bison) can interbreed with domestic cattle.
Gaur (Indian bison) can interbreed with domestic cattle.
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White peppered moth
White peppered moth
Black morph in peppered moth evolution
Black morph in peppered moth evolution
Male moor frogs become blue during the height of mating season. Blue reflectance may be a form of intersexual communication. It is hypothesised that m
Male moor frogs become blue during the height of mating season. Blue reflectance may be a form of intersexual communication. It is hypothesised that males with brighter blue coloration may signal greater sexual and genetic fitness.
The common garter snake has evolved resistance to the defensive substance tetrodotoxin in its amphibian prey.
The common garter snake has evolved resistance to the defensive substance tetrodotoxin in its amphibian prey.