On Long Island, New York, there's a population of wall lizards that originated from a group in Italy. Several had been imported to be sold as pets many decades ago, and some escaped and started a new population in this suburban area. This is an example of

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The scenario described is an example of the founder effect, where a small group of individuals (the imported wall lizards) establish a new population that is genetically distinct from the original population.

On Long Island, New York, There's a Population of Wall