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Receptive females usually show a preference for males with large size, large ornaments, and high courtship activity, as in the guppy .
The guppy is a small freshwater poeciliid fish native to Trinidad and parts of South America, and has been used extensively in laboratory based research, particularly in studies of sexual selection.
The guppy is sexually dichromatic, with males being genetically polymorphic for color patches that vary in hue, chroma, reflectivity, size, number, and location on their body.
How disappointing, then, to find that it's deep under the North Sea (the crater, not Birmingham), and that only the odd curious guppy can enjoy it.
Two studies in the guppy showed directional postcopulatory sexual selection for more colorful males.
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