Megana-Eros

Megana-Eros was the home planet of the ancient Ornikronons.

History
Megana-Eros was inhabited by the Ornikronons, a race of gigantic eagle-like birds. According to legend, long before the Daleks were even created, the Orninkronons built a vast empire of nest planets before migrating to the other side of the universe. In the late 58th century, the Daleks had taken the abandoned planet, Dalek High Command set up a breeding city in the Mountains of Monff for Dalek embryos. In 5874, as the population of embryos massed to ten billion, two million Ornikronons returned to their home with a swift and merciless surpise attack. Only a thousand Daleks had been assigned to guard the city, standing no chance against the Ornikronon's crushing claws and drill-like beaks. After just half a day of battle, with most of the Daleks dead and stacked up in the Ornikronon's massive nests. The Ornikronons were seemingly victorious until a nearby Dalek Battle Cruiser used its dark matter cannon to destroy Megana-Eros, taking the Ornikronons and Dalek embryos with it. (DWBIT: #47)

A. Weston noted in 'Great Air Battles of the 59th Century' that the destruction of Megana-Eros was only the start of the massacre of the Ornikronons, suggesting that either more Ornikronons followed or the Daleks found where they resided.