What is unusual about Aeschylus’s reported death involving an eagle and a tortoise?

The story that Aeschylus died when an eagle dropped a tortoise on his bald head is considered a "ludicrous" and likely fabricated tale.1

According to historical records, this account was presumably invented by a later comic writer rather than being a factual report of the playwright's death. In reality, Aeschylus died in 456/455 BCE at Gela, on the south coast of Sicily, where he was honored with a public funeral and became a figure of pilgrimage for later writers.1