But the mainland population of Puerto Ricans (like the island's, almost four million) is watching, too.
The mainland population, princetoniana, shows these yellow wings while the nominate is restricted to the Falkland Islands and it has only limited yellow fringes to the wings.
If the genetic analysis of this specimen shows no sign of divergence from the mainland population then we can rule out this possibility.
Two-thirds of the way down Chile's long, rugged coastline, the 40 or so small islands of Chiloé are seldom visited by the mainland population.
As the last ice age drew to a close some 10,000 years ago, the mainland population perished, victims of climate change and human hunters.
The mainland population is now tiny, and perhaps numbers just a few hundred birds, at least some of which move north in winter, as far north as Buenos Aires province.
The latter name is a good one, as the mainland population has nearly entirely yellow wings and is an absolute show-stopper when it flies up from the cold, windy grassy Patagonian steppe.
In our fruit-flies-in-rotten-bananas-in-a-hurricane example, allopatry kicked off the speciation process, but different selection pressures on the island caused the island population to diverge genetically from the mainland population.
In the island scale, some of LPIs regularly changed with the changes in island area, distance to the mainland, population and GDP, yet ERIs were generally insensitive to landscape pattern.
Fruit flies from a mainland population are carried to an island in a hurricane.
They evolve in isolation on the island and evolve genetic differences from the mainland population.
