It radiated adaptively into many new species. This is common when a species encounters diverse niches of Island groups. See Darwin's finches.
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They had descended with modification from a common mainland ancestor.
That the finches were similar to the ones on the mainland, but had adapted to the island environment.
They crossed over and marched on into mainland Greece.
the finches originally came from south American main land
Both Jason and Aeneas sail through the Strait of Messina(between Sicily and the Italian mainland) so they both have to slip between Scylla (a reef-nymph, who crushes boats which sail too close to the mainland) and Charybdis (a whirlpool spirit, who sinks boats which follow a course too close to Sicily).
mainland
As the Persian invasion of the Greek mainland city-states did not begin until 480 BCE, nothing much.
Allied invasion of Italy happened on 1943-09-16.
The Ionian Greek city-states in Asia Minor revolted against Persian rule. The war spread to mainland Greece.
From the island the mainland is clearly visible. Mainland here means that the land is part of a continent and can be seen from an island which is separated from the mainland by water.