Back in the 1800s, Europeans bred carp until the breeders crafted a small population that lost all its scales. In 1912 some of these scale-free carp were transported to Madagascar, which had no native carp populations. Within a few decades some of the carp escaped and colonized natural Madagascar waters. Then, remarkably, some fish re-grew the scales their captive ancestors had completely lost. How did this happen?
Read more here: icr.org
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