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Sure but it still stands for birds, which are the best off hand example of a heavily k species with high mortality. They also are the most prone to fischerian runaway issues and are the primary and best example of the phenomenon. Possums can be another good example.

The guppy experiment was merely about the 'good genes' hypothesis as guppies are easily bred in captivity and mature quickly, they are optimal for this sort of study. Its also worth nothing that the concept being studied is overbroad and generally applicable to all forms of sexual reproduction, not just animals leaning more r.