The Aeginetans died out due to a combination of factors, including natural disasters, such as earthquakes and tsunamis, and invasions from other Greek city-states, such as Athens and Sparta. Additionally, the Aeginetans were also affected by the Peloponnesian War, which decimated the population of the entire region.
To repopulate the island, the Aeginetans used animals such as goats, sheep, and pigs. These animals were brought to the island from other parts of Greece and were used to provide food and other resources for the new population. Additionally, the Aeginetans also brought in new settlers from other Greek city-states, such as Athens and Sparta, to help repopulate the island.