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Clocking in at around 35 pounds, the great bustard is often referred to as the “flying fortress,” Bird says, because it’s the heaviest flying bird.

The great bustard has been reintroduced to Salisbury Plain.

David Waters, from the GBG, said if it was a "reasonable year" it would be the first "new great bustard population" to be established "anywhere in the world."

This is the first time great bustard eggs have been moved over such distances Six great bustard eggs flown over from Russia have been hatched in Wiltshire.

Bitterns used to boom and breed in the bog, and once, though only once, a great bustard was shot.