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A female cobalt blue zebra cichlid
A female cobalt blue zebra cichlid
Ernst Mayr in 1994
Ernst Mayr in 1994
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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.